M-x checkdoc on the file foo.el below complains

    Name emacs should appear capitalized as Emacs (C-h,f,e,n,p,q)

at the `(emacs)' info link.  I hoped it would recognise that has to be
left as-is, since it must follow the target document's name and nodes.

Perhaps the following, dragging in help-mode.el for a definitive regexp,
and using thingatpt.el just because it's a convenient way to match
surrounding point.

2009-07-25  Kevin Ryde  <user42@zip.com.au>

	* emacs-lisp/checkdoc.el (checkdoc-proper-noun-region-engine): Allow
	uncapitalized in info node hyperlinks.