doc: trivial typo in git-format-patch.txt

Oblomov · gitster · commit 7ba1ceef9595 · 2017-04-17T20:25:12.000-07:00
Signed-off-by: Giuseppe Bilotta &lt;giuseppe.bilotta@gmail.com&gt;
Reviewed-by: Jonathan Nieder &lt;jrnieder@gmail.com&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/Documentation/git-format-patch.txt b/Documentation/git-format-patch.txt
@@ -551,7 +551,7 @@ series A, B, C, the history would be like:
 ................................................
 
 With `git format-patch --base=P -3 C` (or variants thereof, e.g. with
-`--cover-letter` of using `Z..C` instead of `-3 C` to specify the
+`--cover-letter` or using `Z..C` instead of `-3 C` to specify the
 range), the base tree information block is shown at the end of the
 first message the command outputs (either the first patch, or the
 cover letter), like this:
