Doc: fix trivial typo in SubmittingPatches

This patch changes the tense of a verb in SubmittingPatches to ensure
grammatical validity of the containing sentence.

Signed-off-by: Benjamin Herr <ben@0x539.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/SubmittingPatches b/Documentation/SubmittingPatches
index 56ef2e6..80b9f54 100644
--- a/Documentation/SubmittingPatches
+++ b/Documentation/SubmittingPatches
@@ -90,7 +90,7 @@
 
 Make sure your patch does not include any extra files which do not
 belong in a patch submission.  Make sure to review your patch -after-
-generated it with diff(1), to ensure accuracy.
+generating it with diff(1), to ensure accuracy.
 
 If your changes produce a lot of deltas, you need to split them into
 individual patches which modify things in logical stages; see section