Documentation: fix a few typos in git-notes.txt

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Acked-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-notes.txt

@@ -46,13 +46,13 @@ list::
 
 add::
 	Add notes for a given object (defaults to HEAD). Abort if the
-	object already has notes, abort. (use `-f` to overwrite an
+	object already has notes (use `-f` to overwrite an
 	existing note).
 
 copy::
 	Copy the notes for the first object onto the second object.
 	Abort if the second object already has notes, or if the first
-	objects has none. (use -f to overwrite existing notes to the
+	object has none (use -f to overwrite existing notes to the
 	second object). This subcommand is equivalent to:
 	`git notes add [-f] -C $(git notes list <from-object>) <to-object>`