Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/speech_v1beta1.speech.html b/docs/dyn/speech_v1beta1.speech.html
index 2f96060..628ebbc 100644
--- a/docs/dyn/speech_v1beta1.speech.html
+++ b/docs/dyn/speech_v1beta1.speech.html
@@ -76,15 +76,17 @@
 <h2>Instance Methods</h2>
 <p class="toc_element">
   <code><a href="#asyncrecognize">asyncrecognize(body, x__xgafv=None)</a></code></p>
-<p class="firstline">Perform asynchronous speech-recognition: receive results via the</p>
+<p class="firstline">Performs asynchronous speech recognition: receive results via the</p>
 <p class="toc_element">
   <code><a href="#syncrecognize">syncrecognize(body, x__xgafv=None)</a></code></p>
-<p class="firstline">Perform synchronous speech-recognition: receive results after all audio</p>
+<p class="firstline">Performs synchronous speech recognition: receive results after all audio</p>
 <h3>Method Details</h3>
 <div class="method">
     <code class="details" id="asyncrecognize">asyncrecognize(body, x__xgafv=None)</code>
-  <pre>Perform asynchronous speech-recognition: receive results via the
-google.longrunning.Operations interface. Returns either an
+  <pre>Performs asynchronous speech recognition: receive results via the
+[google.longrunning.Operations]
+(/speech/reference/rest/v1beta1/operations#Operation)
+interface. Returns either an
 `Operation.error` or an `Operation.response` which contains
 an `AsyncRecognizeResponse` message.
 
@@ -246,7 +248,7 @@
 
 <div class="method">
     <code class="details" id="syncrecognize">syncrecognize(body, x__xgafv=None)</code>
-  <pre>Perform synchronous speech-recognition: receive results after all audio
+  <pre>Performs synchronous speech recognition: receive results after all audio
 has been sent and processed.
 
 Args: