[FAB-11706] Fix broken link to unit test doc

This fixes the broken link to the unit test link
in Read-the-docs for unit tests descriptions.

FAB-11706 #done

Change-Id: I6690650b70ad2d37122f042a4793c730bacf5dde
Signed-off-by: Latitia M Haskins <latitia.haskins@gmail.com>

Author: lhaskins

testingInfo.rst

@@ -6,7 +6,7 @@ Testing
 
 Unit test
 ~~~~~~~~~
-See :doc:`building Hyperledger Fabric <dev-setup/build>` for unit testing instructions.
+See `building Hyperledger Fabric <http://hyperledger-fabric.readthedocs.io/en/latest/dev-setup/build.html>` for unit testing instructions.
 
 See `Unit test coverage reports <https://jenkins.hyperledger.org/view/fabric/job/fabric-merge-x86_64/>`__