Update docs (#291)

diff --git a/docs/dyn/sqladmin_v1beta4.backupRuns.html b/docs/dyn/sqladmin_v1beta4.backupRuns.html
index 4e62913..c75b21f 100644
--- a/docs/dyn/sqladmin_v1beta4.backupRuns.html
+++ b/docs/dyn/sqladmin_v1beta4.backupRuns.html
@@ -82,7 +82,7 @@
 <p class="firstline">Retrieves a resource containing information about a backup run.</p>
 <p class="toc_element">
   <code><a href="#insert">insert(project, instance, body)</a></code></p>
-<p class="firstline">Creates a new backup run on demand.</p>
+<p class="firstline">Creates a new backup run on demand. This method is applicable only to Second Generation instances.</p>
 <p class="toc_element">
   <code><a href="#list">list(project, instance, maxResults=None, pageToken=None)</a></code></p>
 <p class="firstline">Lists all backup runs associated with a given instance and configuration in the reverse chronological order of the enqueued time.</p>
@@ -195,7 +195,7 @@
 
 <div class="method">
     <code class="details" id="insert">insert(project, instance, body)</code>
-  <pre>Creates a new backup run on demand.
+  <pre>Creates a new backup run on demand. This method is applicable only to Second Generation instances.
 
 Args:
   project: string, Project ID of the project that contains the instance. (required)