Stop keeping multiple doc copies for items defined multiple times

It was always a nuisance to keep all the copies in sync.
* src/doc.c (Fsnarf_documentation): Don't skip entire files.
Instead, skip individual doc strings starting with "SKIP".
* doc/lispref/internals.texi (Writing Emacs Primitives):
Mention this skipping.
* lisp/term/ns-win.el, lisp/term/pc-win.el, src/dosfns.c:
* src/frame.c, src/nsfns.m, src/nsmenu.m, src/nsterm.m:
* src/w16select.c, src/w32fns.c, src/w32menu.c, src/w32select.c:
* src/w32term.c, src/xmenu.c: Remove duplicated doc strings.
* src/xfns.c: Merge in information from doc string duplicates.

1 files changed, 1 insertions, 5 deletions

diff --git a/src/dosfns.c b/src/dosfns.c
index c6d4d5b8d82..f9845a3049d 100644
--- a/src/dosfns.c
+++ b/src/dosfns.c
@@ -480,11 +480,7 @@ x_set_title (struct frame *f, Lisp_Object name)
 #endif /* !HAVE_X_WINDOWS */
 
 DEFUN ("file-system-info", Ffile_system_info, Sfile_system_info, 1, 1, 0,
-       doc: /* Return storage information about the file system FILENAME is on.
-Value is a list of floats (TOTAL FREE AVAIL), where TOTAL is the total
-storage of the file system, FREE is the free storage, and AVAIL is the
-storage available to a non-superuser.  All 3 numbers are in bytes.
-If the underlying system call fails, value is nil.  */)
+       doc: /* SKIP: real doc in fileio.c.  */)
   (Lisp_Object filename)
 {
   struct statfs stfs;