chore: regens API reference docs (#889)

diff --git a/docs/dyn/classroom_v1.invitations.html b/docs/dyn/classroom_v1.invitations.html
index 2fb302f..3b6b5f3 100644
--- a/docs/dyn/classroom_v1.invitations.html
+++ b/docs/dyn/classroom_v1.invitations.html
@@ -78,7 +78,7 @@
   <code><a href="#accept">accept(id, x__xgafv=None)</a></code></p>
 <p class="firstline">Accepts an invitation, removing it and adding the invited user to the</p>
 <p class="toc_element">
-  <code><a href="#create">create(body, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates an invitation. Only one invitation for a user and course may exist</p>
 <p class="toc_element">
   <code><a href="#delete">delete(id, x__xgafv=None)</a></code></p>
@@ -133,7 +133,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="create">create(body, x__xgafv=None)</code>
+    <code class="details" id="create">create(body=None, x__xgafv=None)</code>
   <pre>Creates an invitation. Only one invitation for a user and course may exist
 at a time. Delete and re-create an invitation to make changes.
 
@@ -148,11 +148,13 @@
 already exists.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # An invitation to join a course.
     "courseId": "A String", # Identifier of the course to invite the user to.
+    "role": "A String", # Role to invite the user to have.
+        # Must not be `COURSE_ROLE_UNSPECIFIED`.
     "userId": "A String", # Identifier of the invited user.
         # 
         # When specified as a parameter of a request, this identifier can be set to
@@ -161,8 +163,6 @@
         # * the numeric identifier for the user
         # * the email address of the user
         # * the string literal `"me"`, indicating the requesting user
-    "role": "A String", # Role to invite the user to have.
-        # Must not be `COURSE_ROLE_UNSPECIFIED`.
     "id": "A String", # Identifier assigned by Classroom.
         # 
         # Read-only.
@@ -178,6 +178,8 @@
 
     { # An invitation to join a course.
       "courseId": "A String", # Identifier of the course to invite the user to.
+      "role": "A String", # Role to invite the user to have.
+          # Must not be `COURSE_ROLE_UNSPECIFIED`.
       "userId": "A String", # Identifier of the invited user.
           #
           # When specified as a parameter of a request, this identifier can be set to
@@ -186,8 +188,6 @@
           # * the numeric identifier for the user
           # * the email address of the user
           # * the string literal `"me"`, indicating the requesting user
-      "role": "A String", # Role to invite the user to have.
-          # Must not be `COURSE_ROLE_UNSPECIFIED`.
       "id": "A String", # Identifier assigned by Classroom.
           #
           # Read-only.
@@ -248,6 +248,8 @@
 
     { # An invitation to join a course.
       "courseId": "A String", # Identifier of the course to invite the user to.
+      "role": "A String", # Role to invite the user to have.
+          # Must not be `COURSE_ROLE_UNSPECIFIED`.
       "userId": "A String", # Identifier of the invited user.
           #
           # When specified as a parameter of a request, this identifier can be set to
@@ -256,8 +258,6 @@
           # * the numeric identifier for the user
           # * the email address of the user
           # * the string literal `"me"`, indicating the requesting user
-      "role": "A String", # Role to invite the user to have.
-          # Must not be `COURSE_ROLE_UNSPECIFIED`.
       "id": "A String", # Identifier assigned by Classroom.
           #
           # Read-only.
@@ -309,6 +309,8 @@
     "invitations": [ # Invitations that match the list request.
       { # An invitation to join a course.
           "courseId": "A String", # Identifier of the course to invite the user to.
+          "role": "A String", # Role to invite the user to have.
+              # Must not be `COURSE_ROLE_UNSPECIFIED`.
           "userId": "A String", # Identifier of the invited user.
               #
               # When specified as a parameter of a request, this identifier can be set to
@@ -317,8 +319,6 @@
               # * the numeric identifier for the user
               # * the email address of the user
               # * the string literal `"me"`, indicating the requesting user
-          "role": "A String", # Role to invite the user to have.
-              # Must not be `COURSE_ROLE_UNSPECIFIED`.
           "id": "A String", # Identifier assigned by Classroom.
               #
               # Read-only.