Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
diff --git a/docs/dyn/sqladmin_v1beta4.tiers.html b/docs/dyn/sqladmin_v1beta4.tiers.html
index 5c4199e..206539b 100644
--- a/docs/dyn/sqladmin_v1beta4.tiers.html
+++ b/docs/dyn/sqladmin_v1beta4.tiers.html
@@ -72,15 +72,15 @@
 
 </style>
 
-<h1><a href="sqladmin_v1beta4.html">Cloud SQL Administration API</a> . <a href="sqladmin_v1beta4.tiers.html">tiers</a></h1>
+<h1><a href="sqladmin_v1beta4.html">Cloud SQL Admin API</a> . <a href="sqladmin_v1beta4.tiers.html">tiers</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
   <code><a href="#list">list(project)</a></code></p>
-<p class="firstline">Lists all available service tiers for Google Cloud SQL, for example D1, D2. For related information, see Pricing.</p>
+<p class="firstline">Lists all available machine types (tiers) for Cloud SQL, for example, db-n1-standard-1. For related information, see Pricing.</p>
 <h3>Method Details</h3>
 <div class="method">
     <code class="details" id="list">list(project)</code>
-  <pre>Lists all available service tiers for Google Cloud SQL, for example D1, D2. For related information, see Pricing.
+  <pre>Lists all available machine types (tiers) for Cloud SQL, for example, db-n1-standard-1. For related information, see Pricing.
 
 Args:
   project: string, Project ID of the project for which to list tiers. (required)
@@ -92,7 +92,7 @@
     "items": [ # List of tiers.
       { # A Google Cloud SQL service tier resource.
         "DiskQuota": "A String", # The maximum disk size of this tier in bytes.
-        "tier": "A String", # An identifier for the service tier, for example D1, D2 etc. For related information, see Pricing.
+        "tier": "A String", # An identifier for the machine type, for example, db-n1-standard-1. For related information, see Pricing.
         "kind": "sql#tier", # This is always sql#tier.
         "RAM": "A String", # The maximum RAM usage of this tier in bytes.
         "region": [ # The applicable regions for this tier.