Fix typo in manual.

Author: 0b10011

doc/manual.html

@@ -1120,7 +1120,7 @@ <h2 id="modeapi">Writing CodeMirror Modes</h2>
     state.</p>
 
     <p id="indent">If you want your mode to provide smart indentation
-    (though the <a href="#indentLine"><code>indentLine</code></a>
+    (through the <a href="#indentLine"><code>indentLine</code></a>
     method and the <code>indentAuto</code>
     and <code>newlineAndIndent</code> commands, which keys can be
     <a href="#option_extraKeys">bound</a> to), you must define