Documentation: fix git-format-patch mark-up and link it from git.txt

Two asterisks the SYNOPSIS section were mistaken as emphasis,
and the latter backtick in "`<key>`s" were not recognized as
closing backtick.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Documentation/git-for-each-ref.txt

@@ -7,14 +7,14 @@ git-for-each-ref - Output information on each ref
 
 SYNOPSIS
 --------
-'git-for-each-ref' [--count=<count>]* [--shell|--perl|--python] [--sort=<key>]* [--format=<format>] [<pattern>]
+'git-for-each-ref' [--count=<count>]\* [--shell|--perl|--python] [--sort=<key>]\* [--format=<format>] [<pattern>]
 
 DESCRIPTION
 -----------
 
 Iterate over all refs that match `<pattern>` and show them
 according to the given `<format>`, after sorting them according
-to the given set of `<key>`s.  If `<max>` is given, stop after
+to the given set of `<key>`.  If `<max>` is given, stop after
 showing that many refs.  The interporated values in `<format>`
 can optionally be quoted as string literals in the specified
 host language allowing their direct evaluation in that language.

Documentation/git.txt

@@ -160,6 +160,9 @@ gitlink:git-diff-stages[1]::
 gitlink:git-diff-tree[1]::
 	Compares the content and mode of blobs found via two tree objects.
 
+gitlink:git-for-each-ref[1]::
+	Output information on each ref.
+
 gitlink:git-fsck-objects[1]::
 	Verifies the connectivity and validity of the objects in the database.