Add Documentation of SDC-Helm-Validator container

Issue-ID: SDC-3185
Signed-off-by: Tomasz Wrobel <tomasz.wrobel@nokia.com>
Change-Id: I85972698bb4e0b42694acf1d97980e45cda0d81d
Signed-off-by: Joanna Jeremicz <joanna.jeremicz@nokia.com>
diff --git a/docs/conf.py b/docs/conf.py
index 4b24057..e78ac0c 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -12,7 +12,21 @@
 
 intersphinx_mapping['onap-doc'] = ('{}/en/%s'.format(doc_onap_url) % branch, None)
 
+
+def prepare_rst_epilog():
+    git_branch = branch
+    if git_branch == 'latest':
+        git_branch = 'master'
+    return """
+.. |sdc-helm-validator-open-api| replace:: SDC Helm Validator OpenAPI.yaml
+.. _sdc-helm-validator-open-api: https://gerrit.onap.org/r/gitweb?p=sdc/sdc-helm-validator.git;a=blob_plain;f=OpenAPI.yaml;hb=refs/heads/{branch}
+""".format(branch=git_branch)
+
+rst_epilog = prepare_rst_epilog()
+
 html_last_updated_fmt = '%d-%b-%y %H:%M'
 
 def setup(app):
     app.add_stylesheet("css/ribbon.css")
+
+