chore: Update discovery artifacts (#1386)

## Deleted keys were detected in the following stable discovery artifacts:
admin directory_v1 https://github.com/googleapis/google-api-python-client/commit/7bac81fc588ccbe7b5e6c75af52b719e73efd118
doubleclickbidmanager v1.1 https://github.com/googleapis/google-api-python-client/commit/895ff465e58dffd1f6e29dffd673418c76007e1b

## Discovery Artifact Change Summary:
feat(adexchangebuyer): update the api https://github.com/googleapis/google-api-python-client/commit/3cf7a8dceb567f3c89c307f3496c381af91b0fc6
feat(admin): update the api https://github.com/googleapis/google-api-python-client/commit/7bac81fc588ccbe7b5e6c75af52b719e73efd118
feat(content): update the api https://github.com/googleapis/google-api-python-client/commit/aab557d6c59a5c414d0ac0bc6349763523c9816f
feat(dfareporting): update the api https://github.com/googleapis/google-api-python-client/commit/c83912bec60626d3388fbe749d7a395fa3bc6c22
feat(doubleclickbidmanager): update the api https://github.com/googleapis/google-api-python-client/commit/895ff465e58dffd1f6e29dffd673418c76007e1b
feat(servicecontrol): update the api https://github.com/googleapis/google-api-python-client/commit/facd7ecc18c129cf8010d19d3969e8d5b4598dfc
diff --git a/docs/dyn/drive_v2.files.html b/docs/dyn/drive_v2.files.html
index b78eeef..cbc3565 100644
--- a/docs/dyn/drive_v2.files.html
+++ b/docs/dyn/drive_v2.files.html
@@ -293,7 +293,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -678,7 +678,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -1128,7 +1128,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -1527,7 +1527,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -1915,7 +1915,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -2317,7 +2317,7 @@
       "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
         "A String",
       ],
-      "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+      "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
         { # Information about a Drive user.
           "displayName": "A String", # A plain text displayable name for this user.
           "emailAddress": "A String", # The email address of the user.
@@ -2714,7 +2714,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -3109,7 +3109,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -3490,7 +3490,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -3871,7 +3871,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -4252,7 +4252,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -4629,7 +4629,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.
@@ -5026,7 +5026,7 @@
   "ownerNames": [ # Name(s) of the owner(s) of this file. Not populated for items in shared drives.
     "A String",
   ],
-  "owners": [ # The owner(s) of this file. Not populated for items in shared drives.
+  "owners": [ # The owner of this file. Only certain legacy files may have more than one owner. This field isn't populated for items in shared drives.
     { # Information about a Drive user.
       "displayName": "A String", # A plain text displayable name for this user.
       "emailAddress": "A String", # The email address of the user.