Dynamically generate a heading for Extension Docs API pages

chrome/common/extensions/docs/templates/intros/ttsEngine.html

-<p id="classSummary">
-Use the <code>chrome.ttsEngine</code> module to
-implement a text-to-speech (TTS) engine using an extension. If your
-extension registers using this API, it will receive events containing
-an utterance to be spoken and other parameters when any extension or packaged
-app uses the
-<a href="tts.html">tts</a>
-module to generate speech. Your extension can then use any available
-web technology to synthesize and output the speech, and send events back
-to the calling function to report the status.
-</p>
-
-
 <h2 id="overview">Overview</h2>
 
 <p>An extension can register itself as a speech engine. By doing so, it
 can intercept some or all calls to functions such as
 $ref:tts.speak and
 $ref:tts.stop
 and provide an alternate implementation.
 Extensions are free to use any available web technology
 to provide speech, including streaming audio from a server, HTML5 audio,
 Native Client, or Flash. An extension could even do something different
@@ skipping 122 matching lines @@
 If your extension does not register listeners for both
 <code>onSpeak</code> and <code>onStop</code>, it will not intercept any
 speech calls, regardless of what is in the manifest.</p>
 
 <p>The decision of whether or not to send a given speech request to an
 extension is based solely on whether the extension supports the given voice
 parameters in its manifest and has registered listeners
 for <code>onSpeak</code> and <code>onStop</code>. In other words,
 there's no way for an extension to receive a speech request and
 dynamically decide whether to handle it.</p>