doc: no Node.js(1)

Node.js(1) does not make sense.
Node(1) would, but this isn’t a `man` page.

PR-URL: https://github.com/nodejs/node/pull/6167
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Robert Jefe Lindstädt <robert.lindstaedt@gmail.com>

doc/template.html

@@ -13,7 +13,7 @@
     <div id="column2" class="interior">
       <div id="intro" class="interior">
         <a href="/" title="Go back to the home page">
-          Node.js (1)
+          Node.js
         </a>
       </div>
       __GTOC__