Documentation: fix misuses of "nor"

Signed-off-by: Justin Lebar <jlebar@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/howto/rebase-from-internal-branch.txt b/Documentation/howto/rebase-from-internal-branch.txt
index 19ab604..02cb5f7 100644
--- a/Documentation/howto/rebase-from-internal-branch.txt
+++ b/Documentation/howto/rebase-from-internal-branch.txt
@@ -139,7 +139,7 @@
     $ git fetch upstream
 
 This leaves the updated upstream head in .git/FETCH_HEAD but
-does not touch your .git/HEAD nor .git/refs/heads/master.
+does not touch your .git/HEAD or .git/refs/heads/master.
 You run "git rebase" now.
 
     $ git rebase FETCH_HEAD master