refactor(pr217): resolve the two first review changes in pull request materializecss#217

Author: LoganTann

pug/about/about_content.html

@@ -66,7 +66,7 @@ <h5>The community</h5>
 
         <h5>The original team</h5>
         <p class="caption">MaterializeCSS was originally launched in 2014 by a team of students from Carnegie Mellon University.
-After 4 years of development, the latest official release have been released in september 2018 and received more than
+After 4 years of development, the latest official release was released in September 2018 and received more than
 38K stars on github.</p>
 
         <div class="center">

pug/index/index_content.html

@@ -33,7 +33,7 @@ <h4 class="light">Simple. Built on open source. The responsive front-end library
         <div class="row">
             <div class="col s12 m10 offset-m1">
               <p class="grey-text" style="font-size: 0.8em;">Note : This is a community-managed fork of the official MaterializeCSS library.
-                Since the project's support have been dropped by the original team, this version is 100% community-powered, meaning that bug fixes or new features
+                Since the project's support has been dropped by the original team, this version is 100% community-powered, meaning that bug fixes or new features
                 are implemented by volunteers but are not official.</p>
             </div>
         </div>