Fix typos in the documentation

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index 1b1c45d..ba2006d 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -157,7 +157,7 @@
    --sort=<key>
    --abbrev[=<n>]
 
- Possibility of multiple occurences is indicated by three dots:
+ Possibility of multiple occurrences is indicated by three dots:
    <file>...
    (One or more of <file>.)