chore: regens API reference docs (#889)

diff --git a/docs/dyn/fitness_v1.users.sessions.html b/docs/dyn/fitness_v1.users.sessions.html
index fe8e74a..80c9683 100644
--- a/docs/dyn/fitness_v1.users.sessions.html
+++ b/docs/dyn/fitness_v1.users.sessions.html
@@ -78,13 +78,13 @@
   <code><a href="#delete">delete(userId, sessionId, currentTimeMillis=None)</a></code></p>
 <p class="firstline">Deletes a session specified by the given session ID.</p>
 <p class="toc_element">
-  <code><a href="#list">list(userId, includeDeleted=None, pageToken=None, startTime=None, endTime=None)</a></code></p>
+  <code><a href="#list">list(userId, includeDeleted=None, pageToken=None, startTime=None, activityType=None, endTime=None)</a></code></p>
 <p class="firstline">Lists sessions previously created.</p>
 <p class="toc_element">
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#update">update(userId, sessionId, body, currentTimeMillis=None)</a></code></p>
+  <code><a href="#update">update(userId, sessionId, body=None, currentTimeMillis=None)</a></code></p>
 <p class="firstline">Updates or insert a given session.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -99,7 +99,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(userId, includeDeleted=None, pageToken=None, startTime=None, endTime=None)</code>
+    <code class="details" id="list">list(userId, includeDeleted=None, pageToken=None, startTime=None, activityType=None, endTime=None)</code>
   <pre>Lists sessions previously created.
 
 Args:
@@ -107,6 +107,7 @@
   includeDeleted: boolean, If true, deleted sessions will be returned. When set to true, sessions returned in this response will only have an ID and will not have any other fields.
   pageToken: string, The continuation token, which is used for incremental syncing. To get the next batch of changes, set this parameter to the value of nextPageToken from the previous response. This token is treated as a timestamp (in millis since epoch). If specified, the API returns sessions modified since this time. The page token is ignored if either start or end time is specified. If none of start time, end time, and the page token is specified, sessions modified in the last 30 days are returned.
   startTime: string, An RFC3339 timestamp. Only sessions ending between the start and end times will be included in the response.
+  activityType: integer, If non-empty, only sessions with these activity types should be returned. (repeated)
   endTime: string, An RFC3339 timestamp. Only sessions ending between the start and end times will be included in the response.
 
 Returns:
@@ -169,13 +170,13 @@
 </div>
 
 <div class="method">
-    <code class="details" id="update">update(userId, sessionId, body, currentTimeMillis=None)</code>
+    <code class="details" id="update">update(userId, sessionId, body=None, currentTimeMillis=None)</code>
   <pre>Updates or insert a given session.
 
 Args:
   userId: string, Create sessions for the person identified. Use me to indicate the authenticated user. Only me is supported at this time. (required)
   sessionId: string, The ID of the session to be created. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Sessions contain metadata, such as a user-friendly name and time interval information.