apply John's review suggestions

Author: bhumi1102

_layouts/post.html

@@ -11,7 +11,7 @@
     <div class="container">
       <div class="post__headline common-headline">
         <h5>{{ page.date | date: '%A, %B %-d, %Y' }}</h5>
-        <h1>{{ page.title | strip_html }}</h2>
+        <h1>{{ page.title | strip_html }}</h1>
 {% if page.author %}
         <h6>Posted by {{ page.author }}</h6>
 {% endif %}