Merge pull request PrismJS#162 from didoarellano/api-docs-fix

Change references to non-existent grammar in API docs

Author: LeaVerou

extending.html

@@ -151,7 +151,7 @@ <h2>Parameters</h2>
 			<dt>text</dt>
 			<dd>A string with the code to be highlighted.</dd>
 			<dt>grammar</dt>
-			<dd>An object containing the tokens to use. Usually a language definition like <code>Prism.languages.html</code></dd>
+			<dd>An object containing the tokens to use. Usually a language definition like <code>Prism.languages.markup</code></dd>
 		</dl>
 
 		<h2>Returns</h2>
@@ -168,7 +168,7 @@ <h2>Parameters</h2>
 			<dt>text</dt>
 			<dd>A string with the code to be highlighted.</dd>
 			<dt>grammar</dt>
-			<dd>An object containing the tokens to use. Usually a language definition like <code>Prism.languages.html</code></dd>
+			<dd>An object containing the tokens to use. Usually a language definition like <code>Prism.languages.markup</code></dd>
 		</dl>
 
 		<h2>Returns</h2>