Fix spelling errors in code comments

Reported-by: Jens Schleusener <Jens.Schleusener@fossies.org>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/rerere.c b/rerere.c
index 3e51fdf..9281131 100644
--- a/rerere.c
+++ b/rerere.c
@@ -431,7 +431,7 @@ static int handle_conflict(struct strbuf *out, struct rerere_io *io,
  * and NUL concatenated together.
  *
  * Return 1 if conflict hunks are found, 0 if there are no conflict
- * hunks and -1 if an error occured.
+ * hunks and -1 if an error occurred.
  */
 static int handle_path(unsigned char *hash, struct rerere_io *io, int marker_size)
 {