Clarify use of # and $ in code blocks

Author: kalexand-rh

contributing_to_docs/doc_guidelines.adoc

@@ -467,6 +467,13 @@ $ oc get endpoints --all-namespaces --template \
     {{ end }}{{ end }}{{ "\n" }}{{ end }}' | awk '/ 172\.30\./ { print $1 }'
 ----
 
+* If the user must run a command as root, use a number sign, `#`, at the start of the command instead of a dollar sign, `$`. For example:
++
+[source, bash]
+----
+# sudo ./openshift start
+----
+
 === Inline Code or Commands
 Do NOT show full commands or command syntax inline within a sentence. The next section covers how to show commands and command syntax.