Update subheadings from <h2> to <p>

Part of whatwg/whatwg.org#401.

layouts/whatwg.hbs

@@ -18,7 +18,7 @@
     WHATWG
    </a>
   </h1>
-  <h2>{{title}}</h2>
+  <p>{{title}}</p>
  </hgroup>
 </header>
 

views/agreement-status.hbs

@@ -65,7 +65,7 @@ label.disabled-control {
 
 <p>You're likely on this page because a GitHub status check on a pull request you submitted was unable to associate you to a signed and verified agreement. Read on to find out what that's about, and the details of your situation.
 
-<h3>Introduction</h3>
+<h2>Introduction</h2>
 
 <p>The <a href="agreement">Participant Agreement</a> must be signed for all contributions to WHATWG Living Standards.
 
@@ -74,7 +74,7 @@ label.disabled-control {
 <p>After an agreement is submitted, it is verified by the WHATWG. This is a manual process, but is usually completed quickly if it's preventing a pull request from being accepted.
 
 
-<h3>Your Status</h3>
+<h2>Your Status</h2>
 
 <p>{{{status}}}</p>
 
@@ -83,7 +83,7 @@ label.disabled-control {
 {{/if}}
 
 
-<h3>Synchronizing with GitHub</h3>
+<h2>Synchronizing with GitHub</h2>
 
 <p>If the status check on your pull request is not in sync with the above, use this form to ask GitHub to update itself:
 

views/entity-agreement-success.hbs

@@ -1,6 +1,6 @@
 <p>Thanks for submitting the participant agreement as an entity. Here is the data we have recorded for you:
 
-<h3>Public Data</h3>
+<h2>Public Data</h2>
 
 <pre>{{publicData}}</pre>
 
@@ -10,13 +10,13 @@
 
 <p>Note that for now your submission is marked as unverified. The first time a contributor associated with {{entityName}} submits a pull request to a standard, the editor will be responsible for verifying that your submission is accurate and representative. After that, future pull requests to the workstreams you chose to participate in will be automatically marked as approved.
 
-<h3>Contributor Management</h3>
+<h2>Contributor Management</h2>
 
 <p>Contributions from GitHub users which are publicly associated with the <a href="https://github.com/{{organizationName}}">{{organizationName}} GitHub organization</a> will be able to contribute on behalf of {{entityName}}.
 
 <p>Note that contributors will need to publicly display their affiliation with the {{organizationName}} organization. For more information on how to do this, see the GitHub help article, "<a href="https://help.github.com/articles/publicizing-or-hiding-organization-membership/">Publicizing or hiding organization membership</a>".
 
-<h3>Notifications</h3>
+<h2>Notifications</h2>
 
 <p>Notifications of WHATWG policy changes and of any <a href="https://whatwg.org/workstream-policy#review-draft">Review Draft</a> publications will be through GitHub issues and pull requests, which you can subscribe to by <a href="https://help.github.com/articles/watching-and-unwatching-repositories/">watching</a> appropriate repositories.
 

views/individual-agreement-success.hbs

@@ -1,6 +1,6 @@
 <p>Thanks for submitting the participant agreement as an individual. Here is the data we have recorded for you:
 
-<h3>Public Data</h3>
+<h2>Public Data</h2>
 
 <pre>{{publicData}}</pre>
 
@@ -10,15 +10,15 @@
 
 <p>Note that for now your submission is marked as unverified. The first time you submit a pull request to a standard, the editor will be responsible for verifying that your submission is accurate and representative. After that, future pull requests to the workstreams you chose to participate in will be automatically marked as approved.
 
-<h3>Private Data</h3>
+<h2>Private Data</h2>
 
 <pre>{{privateData}}</pre>
 
 <p>This private data is only accessible to the Steering Group, and is kept for our records.
 
 <p>If you need to edit this private data in the future, please contact the Steering Group by email: <a href="mailto:{{steeringGroupEmail}}">{{steeringGroupEmail}}</a>.
 
-<h3>Notifications</h3>
+<h2>Notifications</h2>
 
 <p>Notifications of WHATWG policy changes and of any <a href="https://whatwg.org/workstream-policy#review-draft">Review Draft</a> publications will be through GitHub issues and pull requests, which you can subscribe to by <a href="https://help.github.com/articles/watching-and-unwatching-repositories/">watching</a> appropriate repositories.