Fix links to new intersphinx format.

Now that all the projects have anchors.
convert links to intersphinx format

Issue-ID: CIMAN-376
Signed-off-by: Aric Gardner <agardner@linuxfoundation.org>
Change-Id: I9c97ba7f6809446402cc2fa08add67a771e7e0fe
diff --git a/docs/guides/onap-user/instantiate/instantiation/nbi/index.rst b/docs/guides/onap-user/instantiate/instantiation/nbi/index.rst
index 96bbc3a..28ef5d9 100644
--- a/docs/guides/onap-user/instantiate/instantiation/nbi/index.rst
+++ b/docs/guides/onap-user/instantiate/instantiation/nbi/index.rst
@@ -16,7 +16,7 @@
    :maxdepth: 1
    :titlesonly:
 
-   NBI Guide <../../../../../submodules/externalapi/nbi.git/docs/offeredapis/offeredapis.rst>
+:ref:`NBI Guide<onap-externalapi-nbi:offeredapis>`
 
 
 ONAP NBI will convert that request to ONAP SO request.