Fix an error in changelog

Author: seratch

docs-src/changelog.rst

@@ -9,7 +9,7 @@ Refer to `v2.6.2 milestone <https://github.com/slackapi/python-slackclient/miles
 
 **Updates**
 
-1. [RTMClient] #705 WebClient's paginated API calls may fail with no params - Thanks @seratch
+1. [WebClient] #705 WebClient's paginated API calls may fail with no params - Thanks @seratch
 
 v2.6.1 (2020-05-24)
 -------------------

docs/changelog.html

@@ -233,7 +233,7 @@ <h2>v2.6.2 (2020-05-28)<a class="headerlink" href="#v2-6-2-2020-05-28" title="Pe
 <p>Refer to <a class="reference external" href="https://github.com/slackapi/python-slackclient/milestone/9">v2.6.2 milestone</a> to know the complete details of this release.</p>
 <p><strong>Updates</strong></p>
 <ol class="arabic simple">
-<li><p>[RTMClient] #705 WebClient’s paginated API calls may fail with no params - Thanks &#64;seratch</p></li>
+<li><p>[WebClient] #705 WebClient’s paginated API calls may fail with no params - Thanks &#64;seratch</p></li>
 </ol>
 </div>
 <div class="section" id="v2-6-1-2020-05-24">