switch to <h3> for search help headings

config/locales/client.en.yml

@@ -2672,7 +2672,7 @@ en:
           description: Read every post in a topic with more than 100 posts
 
     google_search: |
-      <h2>Search with Google</h2>
+      <h3>Search with Google</h3>
       <p>
         <form action='//google.com/search' id='google-search' onsubmit="document.getElementById('google-query').value = 'site:' + window.location.host + ' ' + document.getElementById('user-query').value; return true;">
           <input type="text" id='user-query' value="">

config/locales/server.en.yml

@@ -2432,7 +2432,7 @@ en:
 
   static:
     search_help: |
-      <h2>Tips</h2>
+      <h3>Tips</h3>
       <p>
       <ul>
         <li>Title matches are prioritized, so when in doubt, search for titles</li>
@@ -2440,7 +2440,7 @@ en:
         <li>Whenever possible, scope your search to a particular category, user, or topic</li>
       </ul>
       </p>
-      <h2>Options</h2>
+      <h3>Options</h3>
       <p>
         <table>
         <tr><td><code>order:views</code></td><td><code>order:latest</code></td><td colspan=3></td></tr>