[1.2.x] removing incorrect references (#507)

* removing incorrect references

* incorporating new changes

---------

Co-authored-by: jmagak <jmagak@redhat.com>

Author: openshift-cherrypick-robot

modules/getting-started/proc-add-source-control-rhdh-catalog.adoc

@@ -1,7 +1,7 @@
 [id='proc-add-source-control-rhdh-catalog_{context}']
 = Adding source control for Catalog in {product}
 
-To populate the Catalog in {product}, you need to add software templates, and to add the templates, you must enable a source control such as GitHub, GitLab, or BitBucket.
+To populate the Catalog in {product}, you need to add software templates, and to add the templates, you must enable a supported source control such as GitHub.
 
 .Prerequisites