chore: regens API reference docs (#889)

diff --git a/docs/dyn/translate_v2.detections.html b/docs/dyn/translate_v2.detections.html
index 79fa347..b7e7bf8 100644
--- a/docs/dyn/translate_v2.detections.html
+++ b/docs/dyn/translate_v2.detections.html
@@ -75,18 +75,18 @@
 <h1><a href="translate_v2.html">Google Cloud Translation API</a> . <a href="translate_v2.detections.html">detections</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#detect">detect(body, x__xgafv=None)</a></code></p>
+  <code><a href="#detect">detect(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Detects the language of text within a request.</p>
 <p class="toc_element">
   <code><a href="#list">list(q, x__xgafv=None)</a></code></p>
 <p class="firstline">Detects the language of text within a request.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="detect">detect(body, x__xgafv=None)</code>
+    <code class="details" id="detect">detect(body=None, x__xgafv=None)</code>
   <pre>Detects the language of text within a request.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The request message for language detection.