Documentation: spelling fixes

[jc: with wording changes from Jonathan Nieder]

Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
index c28603e..42fb1f5 100644
--- a/Documentation/git-commit.txt
+++ b/Documentation/git-commit.txt
@@ -130,11 +130,11 @@
 	Usually recording a commit that has the exact same tree as its
 	sole parent commit is a mistake, and the command prevents you
 	from making such a commit.  This option bypasses the safety, and
-	is primarily for use by foreign scm interface scripts.
+	is primarily for use by foreign SCM interface scripts.
 
 --allow-empty-message::
        Like --allow-empty this command is primarily for use by foreign
-       scm interface scripts. It allows you to create a commit with an
+       SCM interface scripts. It allows you to create a commit with an
        empty commit message without using plumbing commands like
        linkgit:git-commit-tree[1].