name-rev: make --stdin hidden

In 34ae3b70 (name-rev: deprecate --stdin in favor of --annotate-stdin),
we renamed --stdin to --annotate-stdin for the sake of a clearer name
for the option, and added text that indicates --stdin is deprecated. The
next step is to hide --stdin completely.

Make the option hidden. Also, update documentation to remove all
mentions of --stdin.

Signed-off-by: "John Cai" <johncai86@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-name-rev.txt

@@ -10,7 +10,7 @@ SYNOPSIS
 --------
 [verse]
 'git name-rev' [--tags] [--refs=<pattern>]
-	       ( --all | --stdin | <commit-ish>... )
+	       ( --all | --annotate-stdin | <commit-ish>... )
 
 DESCRIPTION
 -----------
@@ -46,7 +46,8 @@ OPTIONS
 	Transform stdin by substituting all the 40-character SHA-1
 	hexes (say $hex) with "$hex ($rev_name)".  When used with
 	--name-only, substitute with "$rev_name", omitting $hex
-	altogether.
+	altogether. This option was called `--stdin` in older versions
+	of Git.
 +
 For example:
 +
@@ -70,10 +71,6 @@ The full name after substitution is master,
 while its tree object is 70d105cc79e63b81cfdcb08a15297c23e60b07ad
 -----------
 
---stdin::
-	This option is deprecated in favor of 'git name-rev --annotate-stdin'.
-	They are functionally equivalent.
-
 --name-only::
 	Instead of printing both the SHA-1 and the name, print only
 	the name.  If given with --tags the usual tag prefix of
@@ -107,7 +104,7 @@ Now you are wiser, because you know that it happened 940 revisions before v0.99.
 Another nice thing you can do is:
 
 ------------
-% git log | git name-rev --stdin
+% git log | git name-rev --annotate-stdin
 ------------
 
 GIT

builtin/name-rev.c

@@ -573,7 +573,11 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
 				   N_("ignore refs matching <pattern>")),
 		OPT_GROUP(""),
 		OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
-		OPT_BOOL(0, "stdin", &transform_stdin, N_("deprecated: use --annotate-stdin instead")),
+		OPT_BOOL_F(0,
+			   "stdin",
+			   &transform_stdin,
+			   N_("deprecated: use --annotate-stdin instead"),
+			   PARSE_OPT_HIDDEN),
 		OPT_BOOL(0, "annotate-stdin", &annotate_stdin, N_("annotate text from stdin")),
 		OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
 		OPT_BOOL(0, "always",     &always,