bug#15038: 24.3.50; Doc bug in "(eintr) Change a defun"

[dmoncayo]

The following paragraph is in the info node mentioned in the subject:

     *Note Beginning a `.emacs' File.emacs File, and *note
  Comments(elisp) for more about comments.

There seems to be a problem in its first cross reference, because:
* The link is broken.
* The part ".emacs File" just after the link doesn't make sense.

(I guess that the problem is due to the use of "@file" inside "@xref")

In GNU Emacs 24.3.50.1 (i686-pc-mingw32)
 of 2013-08-05 on LEG570
Bzr revision: 113709 monnier@iro.umontreal.ca-20130805180546-vbxtmpcn25l6w4fr
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=/c/usr --enable-checking CFLAGS='-O0 -g3'
 CPPFLAGS='-DGLYPH_DEBUG=1 -I/c/usr/include''