chore: regens API reference docs (#889)

diff --git a/docs/dyn/libraryagent_v1.shelves.books.html b/docs/dyn/libraryagent_v1.shelves.books.html
index 3087609..3d6a234 100644
--- a/docs/dyn/libraryagent_v1.shelves.books.html
+++ b/docs/dyn/libraryagent_v1.shelves.books.html
@@ -81,7 +81,7 @@
   <code><a href="#get">get(name, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets a book. Returns NOT_FOUND if the book does not exist.</p>
 <p class="toc_element">
-  <code><a href="#list">list(parent, pageToken=None, x__xgafv=None, pageSize=None)</a></code></p>
+  <code><a href="#list">list(parent, pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Lists books in a shelf. The order is unspecified but deterministic. Newly</p>
 <p class="toc_element">
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
@@ -98,7 +98,7 @@
 allocation quota in any dimensions.
 
 Args:
-  name: string, The name of the book to borrow. (required)
+  name: string, Required. The name of the book to borrow. (required)
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format
@@ -122,7 +122,7 @@
   <pre>Gets a book. Returns NOT_FOUND if the book does not exist.
 
 Args:
-  name: string, The name of the book to retrieve. (required)
+  name: string, Required. The name of the book to retrieve. (required)
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format
@@ -142,13 +142,15 @@
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(parent, pageToken=None, x__xgafv=None, pageSize=None)</code>
+    <code class="details" id="list">list(parent, pageSize=None, pageToken=None, x__xgafv=None)</code>
   <pre>Lists books in a shelf. The order is unspecified but deterministic. Newly
 created books will not necessarily be added to the end of this list.
 Returns NOT_FOUND if the shelf does not exist.
 
 Args:
-  parent: string, The name of the shelf whose books we'd like to list. (required)
+  parent: string, Required. The name of the shelf whose books we'd like to list. (required)
+  pageSize: integer, Requested page size. Server may return fewer books than requested.
+If unspecified, server will pick an appropriate default.
   pageToken: string, A token identifying a page of results the server should return.
 Typically, this is the value of
 ListBooksResponse.next_page_token.
@@ -157,8 +159,6 @@
     Allowed values
       1 - v1 error format
       2 - v2 error format
-  pageSize: integer, Requested page size. Server may return fewer books than requested.
-If unspecified, server will pick an appropriate default.
 
 Returns:
   An object of the form:
@@ -204,7 +204,7 @@
 or the users didn't borrow before.
 
 Args:
-  name: string, The name of the book to return. (required)
+  name: string, Required. The name of the book to return. (required)
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format