build: run docs regen in synth.py (#1059)

diff --git a/docs/dyn/analyticsdata_v1alpha.html b/docs/dyn/analyticsdata_v1alpha.html
index 313e3d6..03dfe67 100644
--- a/docs/dyn/analyticsdata_v1alpha.html
+++ b/docs/dyn/analyticsdata_v1alpha.html
@@ -75,6 +75,11 @@
 <h1><a href="analyticsdata_v1alpha.html">Google Analytics Data API</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
+  <code><a href="analyticsdata_v1alpha.properties.html">properties()</a></code>
+</p>
+<p class="firstline">Returns the properties Resource.</p>
+
+<p class="toc_element">
   <code><a href="analyticsdata_v1alpha.v1alpha.html">v1alpha()</a></code>
 </p>
 <p class="firstline">Returns the v1alpha Resource.</p>