git-multi-pack-index(1): align SYNOPSIS with 'git multi-pack-index -h'

Since c39fffc (tests: start asserting that *.txt SYNOPSIS matches -h
output, 2022-10-13), the manual page for 'git multi-pack-index' has a
SYNOPSIS section which differs from 'git multi-pack-index -h'.

Correct this while also documenting additional options accepted by the
'write' sub-command.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: ttaylorr

Documentation/git-multi-pack-index.adoc

@@ -9,7 +9,12 @@ git-multi-pack-index - Write and verify multi-pack-indexes
 SYNOPSIS
 --------
 [verse]
-'git multi-pack-index' [--object-dir=<dir>] [--[no-]bitmap] <sub-command>
+'git multi-pack-index' [<options>] write [--preferred-pack=<pack>]
+		         [--[no-]bitmap] [--[no-]incremental] [--[no-]stdin-packs]
+		         [--refs-snapshot=<path>]
+'git multi-pack-index' [<options>] verify
+'git multi-pack-index' [<options>] expire
+'git multi-pack-index' [<options>] repack [--batch-size=<size>]
 
 DESCRIPTION
 -----------

builtin/multi-pack-index.c

@@ -13,8 +13,9 @@
 #include "repository.h"
 
 #define BUILTIN_MIDX_WRITE_USAGE \
-	N_("git multi-pack-index [<options>] write [--preferred-pack=<pack>]" \
-	   "[--refs-snapshot=<path>]")
+	N_("git multi-pack-index [<options>] write [--preferred-pack=<pack>]\n" \
+	   "  [--[no-]bitmap] [--[no-]incremental] [--[no-]stdin-packs]\n" \
+	   "  [--refs-snapshot=<path>]")
 
 #define BUILTIN_MIDX_VERIFY_USAGE \
 	N_("git multi-pack-index [<options>] verify")

t/t0450/adoc-help-mismatches

@@ -33,7 +33,6 @@ merge
 merge-file
 merge-index
 merge-one-file
-multi-pack-index
 name-rev
 notes
 push