Merge pull request #60257 from mburke5678/doc-guidelines-admonitions

Add link to SSG for admonitions

Author: mburke5678

contributing_to_docs/doc_guidelines.adoc

@@ -1731,6 +1731,8 @@ Text for admonition
 ====
 ....
 
+See the link:https://redhat-documentation.github.io/supplementary-style-guide/#admonitions[Red Hat Supplementary style guide] for the valid admonition types and their definitions.
+
 [id="api-object-formatting"]
 == API object formatting