Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/content_v2.datafeedstatuses.html b/docs/dyn/content_v2.datafeedstatuses.html
index 1221ee7..529185b 100644
--- a/docs/dyn/content_v2.datafeedstatuses.html
+++ b/docs/dyn/content_v2.datafeedstatuses.html
@@ -79,10 +79,10 @@
 <p class="firstline">A description of how to use this function</p>
 <p class="toc_element">
   <code><a href="#get">get(merchantId, datafeedId)</a></code></p>
-<p class="firstline">Retrieves the status of a datafeed from your Merchant Center account.</p>
+<p class="firstline">Retrieves the status of a datafeed from your Merchant Center account. This method can only be called for non-multi-client accounts.</p>
 <p class="toc_element">
   <code><a href="#list">list(merchantId, pageToken=None, maxResults=None)</a></code></p>
-<p class="firstline">Lists the statuses of the datafeeds in your Merchant Center account.</p>
+<p class="firstline">Lists the statuses of the datafeeds in your Merchant Center account. This method can only be called for non-multi-client accounts.</p>
 <p class="toc_element">
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
@@ -169,7 +169,7 @@
 
 <div class="method">
     <code class="details" id="get">get(merchantId, datafeedId)</code>
-  <pre>Retrieves the status of a datafeed from your Merchant Center account.
+  <pre>Retrieves the status of a datafeed from your Merchant Center account. This method can only be called for non-multi-client accounts.
 
 Args:
   merchantId: string, A parameter (required)
@@ -218,7 +218,7 @@
 
 <div class="method">
     <code class="details" id="list">list(merchantId, pageToken=None, maxResults=None)</code>
-  <pre>Lists the statuses of the datafeeds in your Merchant Center account.
+  <pre>Lists the statuses of the datafeeds in your Merchant Center account. This method can only be called for non-multi-client accounts.
 
 Args:
   merchantId: string, The ID of the managing account. (required)