Documentation: Config filename

Update config filename to accurately match the
filename of the gerrit configuration file

Change-Id: If0531d3bcead4ffd6f44878e3295ce0cd2d92955

src/main/resources/Documentation/config.md

diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index b3f4821..eee011a 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -6,7 +6,7 @@
 if the lengths are exceeded.
 
 The maximum lengths of the subject and message body are can be
-configured in the standard Gerrit config file `config.gerrit`.
+configured in the standard Gerrit config file `gerrit.config`.
 
 commitmessage.maxSubjectLength
 :	Maximum length of the commit message's subject line.  If