chore: regens API reference docs (#889)

diff --git a/docs/dyn/doubleclickbidmanager_v1.lineitems.html b/docs/dyn/doubleclickbidmanager_v1.lineitems.html
index d4fdc48..470cfbf 100644
--- a/docs/dyn/doubleclickbidmanager_v1.lineitems.html
+++ b/docs/dyn/doubleclickbidmanager_v1.lineitems.html
@@ -75,18 +75,18 @@
 <h1><a href="doubleclickbidmanager_v1.html">DoubleClick Bid Manager API</a> . <a href="doubleclickbidmanager_v1.lineitems.html">lineitems</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#downloadlineitems">downloadlineitems(body)</a></code></p>
+  <code><a href="#downloadlineitems">downloadlineitems(body=None)</a></code></p>
 <p class="firstline">Retrieves line items in CSV format. TrueView line items are not supported.</p>
 <p class="toc_element">
-  <code><a href="#uploadlineitems">uploadlineitems(body)</a></code></p>
+  <code><a href="#uploadlineitems">uploadlineitems(body=None)</a></code></p>
 <p class="firstline">Uploads line items in CSV format. TrueView line items are not supported.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="downloadlineitems">downloadlineitems(body)</code>
+    <code class="details" id="downloadlineitems">downloadlineitems(body=None)</code>
   <pre>Retrieves line items in CSV format. TrueView line items are not supported.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request to fetch stored line items.
@@ -108,11 +108,11 @@
 </div>
 
 <div class="method">
-    <code class="details" id="uploadlineitems">uploadlineitems(body)</code>
+    <code class="details" id="uploadlineitems">uploadlineitems(body=None)</code>
   <pre>Uploads line items in CSV format. TrueView line items are not supported.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request to upload line items.