tmpfs(8) link to the mount_tmpfs man page?

[Chris Ross <cross+netbsd%distal.com@localhost>]

  I have now, many times, done "man mfs" and not even noticed that  
the resulting page I see is actually the mount_mfs man page.  However,  
I'm always surprised to find that tmpfs has no man page!  Well, to be  
more specific, my natural action of "man tmpfs" yields no man page.

  In looking at the sources, it appears that mfs may be an oddity,  
and most of the other mount_ programs *don't* have such an MLINKS  
defined.

  Initially, I was thinking we should make an MLINKS entry for  
mount_tmpfs.  But, now I'm wondering if we should in fact *undo* the  
MLINKS linking mfs to mount_mfs.8 (in sbin/newfs).

  I think the inconsistency, at least, should likely be addressed.   
Or is removing something that used to "work" also a "bad thing" in  
NetBSD minds?

  Thanks.

                             - Chris