Fix docs clone path to use relative path

This fixes the clone path so that submodule projects will clone using
the same URL mechanism as the aggregator project.

Issue: VNFRQTS-38
Change-Id: I43ca46be49b950faa06afb8d474c8b733399cfbd
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>
diff --git a/.gitmodules b/.gitmodules
index 03db8a1..a71883f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -5,4 +5,6 @@
 	ignore = dirty
 [submodule "docs/submodules/vnfrqts/requirements"]
 	path = docs/submodules/vnfrqts/requirements
-	url = http://gerrit.onap.org/r/vnfrqts/requirements
+	url = ../vnfrqts/requirements
+	branch = .
+	ignore = dirty