Fix typos in documentation

Change-Id: I764ee0740bd3611dd58f9aa80f9823a20c147ef3
Issue-ID: NONRTRIC-157
Signed-off-by: elinuxhenrik <henrik.b.andersson@est.tech>
diff --git a/docs/installation-guide.rst b/docs/installation-guide.rst
index 26c9133..1bcc3c4 100644
--- a/docs/installation-guide.rst
+++ b/docs/installation-guide.rst
@@ -14,7 +14,7 @@
 
 This document describes how to install the Non-RT RIC SDNC A1 Controller, its dependencies and required system resources.
 
-This work is in progress. Please visit the `api-docs page`_ for more information about the SDNC A1 Controller and the Policy Agent.
+This work is in progress. Please visit :ref:`api_docs` for more information about the SDNC A1 Controller and the Policy Agent.
 
 .. _api-docs page: ./api-docs.html