Documentation: fix a bunch of typos, both old and new

Reported-by: Jens Schleusener <Jens.Schleusener@fossies.org>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/git-check-attr.txt b/Documentation/git-check-attr.txt
index 3c05782..84f41a8 100644
--- a/Documentation/git-check-attr.txt
+++ b/Documentation/git-check-attr.txt
@@ -32,7 +32,7 @@
 	instead of from the command-line.
 
 -z::
-	The output format is modified to be machine-parseable.
+	The output format is modified to be machine-parsable.
 	If `--stdin` is also given, input paths are separated
 	with a NUL character instead of a linefeed character.