documentation: trivial style cleanups

White-spaces, missing braces, standardize --[no-]foo.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/git-am.txt b/Documentation/git-am.txt
index 19d57a8..5bbe7b6 100644
--- a/Documentation/git-am.txt
+++ b/Documentation/git-am.txt
@@ -9,12 +9,12 @@
 SYNOPSIS
 --------
 [verse]
-'git am' [--signoff] [--keep] [--keep-cr | --no-keep-cr] [--utf8 | --no-utf8]
+'git am' [--signoff] [--keep] [--[no-]keep-cr] [--[no-]utf8]
 	 [--3way] [--interactive] [--committer-date-is-author-date]
 	 [--ignore-date] [--ignore-space-change | --ignore-whitespace]
 	 [--whitespace=<option>] [-C<n>] [-p<n>] [--directory=<dir>]
 	 [--exclude=<path>] [--include=<path>] [--reject] [-q | --quiet]
-	 [--scissors | --no-scissors]
+	 [--[no-]scissors]
 	 [(<mbox> | <Maildir>)...]
 'git am' (--continue | --skip | --abort)
 
@@ -43,8 +43,7 @@
 --keep-non-patch::
 	Pass `-b` flag to 'git mailinfo' (see linkgit:git-mailinfo[1]).
 
---keep-cr::
---no-keep-cr::
+--[no-]keep-cr::
 	With `--keep-cr`, call 'git mailsplit' (see linkgit:git-mailsplit[1])
 	with the same option, to prevent it from stripping CR at the end of
 	lines. `am.keepcr` configuration variable can be used to specify the