Default to disabled when gitweb.type is not specified

Change-Id: Ie9c207580745ff4e27f9cebccedeb6979b5aac73
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index cef8d98..234d2c5 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -1975,10 +1975,12 @@
 [[gitweb.type]]gitweb.type::
 +
 Optional type of affiliated gitweb service. This allows using
-alternatives to gitweb, such as cgit. If set to disabled there
-is no gitweb hyperlinking support.
+alternatives to gitweb, such as cgit.
 +
 Valid values are `gitweb`, `cgit`, `disabled` or `custom`.
++
+If not set, or set to `disabled`, there is no gitweb hyperlinking
+support.
 
 [[gitweb.revision]]gitweb.revision::
 +