chore: Update discovery artifacts (#1438)

## Deleted keys were detected in the following stable discovery artifacts:
youtube v3 https://github.com/googleapis/google-api-python-client/commit/ec21dff96d9538ad6c7f9b318eca88178533aa95

## Deleted keys were detected in the following pre-stable discovery artifacts:
firebasehosting v1beta1 https://github.com/googleapis/google-api-python-client/commit/c83ac386b65f82e7ba29851d56b496b09a29cf98

## Discovery Artifact Change Summary:
feat(analyticsadmin): update the api https://github.com/googleapis/google-api-python-client/commit/96675a8d9158ec13353fe241f858201fc51b784d
feat(composer): update the api https://github.com/googleapis/google-api-python-client/commit/add2fbdc3afb6696537eb087bc1d79df9194a37a
feat(container): update the api https://github.com/googleapis/google-api-python-client/commit/f8fae98db6d1943411b1a6c0f5a65dea336569f6
feat(content): update the api https://github.com/googleapis/google-api-python-client/commit/0814e009a4a11800db5b4afd7b6260e504c98047
feat(datacatalog): update the api https://github.com/googleapis/google-api-python-client/commit/99706059e58bb3d616253a1af2cd162b5a0b0279
feat(dataflow): update the api https://github.com/googleapis/google-api-python-client/commit/d5f09ef30392532bcfdd82901148bdd3ac6eec01
feat(docs): update the api https://github.com/googleapis/google-api-python-client/commit/dc66f4cafba86baff6149b2f6e59ae1888006911
feat(file): update the api https://github.com/googleapis/google-api-python-client/commit/523fc5c900f53489d56400deb650f6586c9681a0
feat(firebasehosting): update the api https://github.com/googleapis/google-api-python-client/commit/c83ac386b65f82e7ba29851d56b496b09a29cf98
feat(healthcare): update the api https://github.com/googleapis/google-api-python-client/commit/a407471b14349b8c08018196041568f2a35f8d4f
feat(ideahub): update the api https://github.com/googleapis/google-api-python-client/commit/c6b0d83940f238b1330896240492e8db397dcd15
fix(keep): update the api https://github.com/googleapis/google-api-python-client/commit/08fee732e96d3220e624c8fca7b8a9b0c0bcb146
feat(managedidentities): update the api https://github.com/googleapis/google-api-python-client/commit/863b333da7848029fd1614fd48b46cfbe12afcd5
feat(memcache): update the api https://github.com/googleapis/google-api-python-client/commit/17dc001e4649f54944066ce153e3c552c850a146
feat(metastore): update the api https://github.com/googleapis/google-api-python-client/commit/f3a76c9359babc48cc0b76ce7e3be0711ba028ae
feat(slides): update the api https://github.com/googleapis/google-api-python-client/commit/314d61b9ef8c5c30f9756462504dc0df92284cb2
feat(sqladmin): update the api https://github.com/googleapis/google-api-python-client/commit/62784e0b1b5752b480afe1ddd77dcf412bb35dbb
feat(tpu): update the api https://github.com/googleapis/google-api-python-client/commit/16bf712cca4a393d96e4135de3d02e5005051b6d
feat(youtube): update the api https://github.com/googleapis/google-api-python-client/commit/ec21dff96d9538ad6c7f9b318eca88178533aa95
diff --git a/googleapiclient/discovery_cache/documents/docs.v1.json b/googleapiclient/discovery_cache/documents/docs.v1.json
index a222bf9..28c2e67 100644
--- a/googleapiclient/discovery_cache/documents/docs.v1.json
+++ b/googleapiclient/discovery_cache/documents/docs.v1.json
@@ -3,10 +3,10 @@
     "oauth2": {
       "scopes": {
         "https://www.googleapis.com/auth/documents": {
-          "description": "See, create, and edit all Google Docs documents you have access to"
+          "description": "See, edit, create, and delete all your Google Docs documents"
         },
         "https://www.googleapis.com/auth/documents.readonly": {
-          "description": "View your Google Docs documents"
+          "description": "See all your Google Docs documents"
         },
         "https://www.googleapis.com/auth/drive": {
           "description": "See, edit, create, and delete all of your Google Drive files"
@@ -216,7 +216,7 @@
       }
     }
   },
-  "revision": "20210622",
+  "revision": "20210707",
   "rootUrl": "https://docs.googleapis.com/",
   "schemas": {
     "AutoText": {
@@ -2277,6 +2277,10 @@
           "$ref": "Person",
           "description": "A paragraph element that links to a person or email address."
         },
+        "richLink": {
+          "$ref": "RichLink",
+          "description": "A paragraph element that links to a Google resource (such as a file in Drive, a Youtube video, a Calendar event, etc.)"
+        },
         "startIndex": {
           "description": "The zero-based start index of this paragraph element, in UTF-16 code units.",
           "format": "int32",
@@ -2993,6 +2997,70 @@
       },
       "type": "object"
     },
+    "RichLink": {
+      "description": "A link to a Google resource (e.g., a file in Drive, a YouTube video, a Calendar event, etc.).",
+      "id": "RichLink",
+      "properties": {
+        "richLinkId": {
+          "description": "Output only. The ID of this link.",
+          "readOnly": true,
+          "type": "string"
+        },
+        "richLinkProperties": {
+          "$ref": "RichLinkProperties",
+          "description": "Output only. The properties of this RichLink. This field is always present.",
+          "readOnly": true
+        },
+        "suggestedDeletionIds": {
+          "description": "IDs for suggestions that remove this link from the document. A RichLink might have multiple deletion IDs if, for example, multiple users suggest to delete it. If empty, then this person link isn't suggested for deletion.",
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "suggestedInsertionIds": {
+          "description": "IDs for suggestions that insert this link into the document. A RichLink might have multiple insertion IDs if it is a nested suggested change (a suggestion within a suggestion made by a different user, for example). If empty, then this person link isn't a suggested insertion.",
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "suggestedTextStyleChanges": {
+          "additionalProperties": {
+            "$ref": "SuggestedTextStyle"
+          },
+          "description": "The suggested text style changes to this RichLink, keyed by suggestion ID.",
+          "type": "object"
+        },
+        "textStyle": {
+          "$ref": "TextStyle",
+          "description": "The text style of this RichLink."
+        }
+      },
+      "type": "object"
+    },
+    "RichLinkProperties": {
+      "description": "Properties specific to a RichLink.",
+      "id": "RichLinkProperties",
+      "properties": {
+        "mimeType": {
+          "description": "Output only. The [MIME type](https://developers.google.com/drive/api/v3/mime-types) of the RichLink, if there is one (i.e., when it is a file in Drive).",
+          "readOnly": true,
+          "type": "string"
+        },
+        "title": {
+          "description": "Output only. The title of the RichLink as displayed in the link. This title matches the title of the linked resource at the time of the insertion or last update of the link. This field is always present.",
+          "readOnly": true,
+          "type": "string"
+        },
+        "uri": {
+          "description": "Output only. The URI to the RichLink. This is always present.",
+          "readOnly": true,
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
     "SectionBreak": {
       "description": "A StructuralElement representing a section break. A section is a range of content which has the same SectionStyle. A section break represents the start of a new section, and the section style applies to the section after the section break. The document body always begins with a section break.",
       "id": "SectionBreak",