many small typofixes

Signed-off-by: Ondřej Bílka <neleai@seznam.cz>
Reviewed-by: Marc Branchaud <marcnarc@xiplink.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/lib-t6000.sh

@@ -34,7 +34,7 @@ save_tag () {
 	mv sed.script.tmp sed.script
 }
 
-# Replace unhelpful sha1 hashses with their symbolic equivalents
+# Replace unhelpful sha1 hashes with their symbolic equivalents
 entag () {
 	sed -f sed.script
 }