[DOC] Use the right version for ONAP Frankfurt

The version given for Frankfurt version is not the right one. So we fix
it with this commit.

Issue-ID: OOM-2424
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I9e24f0b15d821904e70d758a978c2979a530adf0
diff --git a/docs/oom_quickstart_guide.rst b/docs/oom_quickstart_guide.rst
index c556dfa..78af191 100644
--- a/docs/oom_quickstart_guide.rst
+++ b/docs/oom_quickstart_guide.rst
@@ -21,9 +21,10 @@
   > cd oom/kubernetes
 
 where <BRANCH> can be an offical release tag, such as
-4.0.0-ONAP for Dublin
-5.0.1-ONAP for El Alto
-6.0.0-ONAP for Frankfurt
+
+* 4.0.0-ONAP for Dublin
+* 5.0.1-ONAP for El Alto
+* 6.0.0 for Frankfurt
 
 **Step 2.** Install Helm Plugins required to deploy ONAP::