Fix extension docs about package.searchers.

doc/extensions.html

@@ -304,7 +304,6 @@ enabled:
 <li><tt>os.exit(status|true|false [,close])</tt>.</li>
 <li><tt>package.searchpath(name, path [, sep [, rep]])</tt>.</li>
 <li><tt>package.loadlib(name, "*")</tt>.</li>
-<li><tt>package.searchers</tt>.</li>
 <li><tt>debug.getinfo()</tt> returns <tt>nparams</tt> and <tt>isvararg</tt>
 for option <tt>"u"</tt>.</li>
 <li><tt>debug.getlocal()</tt> accepts function instead of level.</li>
@@ -338,6 +337,7 @@ exit status.</li>
 <li><tt>debug.setmetatable()</tt> returns object.</li>
 <li><tt>debug.getuservalue()</tt> and <tt>debug.setuservalue()</tt>.</li>
 <li>Remove <tt>math.mod()</tt>, <tt>string.gfind()</tt>.</li>
+<li><tt>package.searchers</tt>.</li>
 </ul>
 <p>
 Note: this provides only partial compatibility with Lua 5.2 at the