Fix links to Gerrit documentation

The links to the Gerrit plugin documentation and index are relative,
and end up pointing to locations within the plugin's documentation,
which results in 404 errors when clicking on them.

Prefix the links with "../../../Documentation/" to make sure they
point at the correct places.

Change-Id: Ic62e8bf45b6c11152c296e5a9086e59f03a6ea5b
diff --git a/src/main/resources/Documentation/cmd-print.md b/src/main/resources/Documentation/cmd-print.md
index fb0c1b9..717b564 100644
--- a/src/main/resources/Documentation/cmd-print.md
+++ b/src/main/resources/Documentation/cmd-print.md
@@ -55,8 +55,8 @@
 SEE ALSO
 --------
 
-* [Plugin Development](dev-plugins.html)
+* [Plugin Development](../../../Documentation/dev-plugins.html)
 
 GERRIT
 ------
-Part of [Gerrit Code Review](index.html)
+Part of [Gerrit Code Review](../../../Documentation/index.html)