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

diff --git a/docs/dyn/realtimebidding_v1.bidders.html b/docs/dyn/realtimebidding_v1.bidders.html
index 3858be9..92bf689 100644
--- a/docs/dyn/realtimebidding_v1.bidders.html
+++ b/docs/dyn/realtimebidding_v1.bidders.html
@@ -80,6 +80,11 @@
 <p class="firstline">Returns the creatives Resource.</p>
 
 <p class="toc_element">
+  <code><a href="realtimebidding_v1.bidders.pretargetingConfigs.html">pretargetingConfigs()</a></code>
+</p>
+<p class="firstline">Returns the pretargetingConfigs Resource.</p>
+
+<p class="toc_element">
   <code><a href="#close">close()</a></code></p>
 <p class="firstline">Close httplib2 connections.</p>
 <h3>Method Details</h3>