Add link to html guide for beginners to classes docs.

Author: kyle-wannacott

public/docs/classes.html

@@ -65,6 +65,11 @@ <h2>table-sort-js</h2>
       <div class="main_content">
         <div class="header">Classes that can be used with table-sort-js.</div>
         <div class="info">
+          <p>A<a
+            href="https://www.websiteplanet.com/blog/html-guide-beginners/"
+            target="blank">
+            guide</a> on using HTML for those unfamiliar with HTML.</p>
+          <br/>
           <table
             class="table table-sort"
             id="classes-table"