doc: outline availability of confluence status role alternative style

The Confluence Status macro role supports configuring Confluence's
"regular" and "outlined" status macro types. When using Confluence's
newer fabric editor, only one of these status macros types are
available. Updating the description of this role to reflect this.

Signed-off-by: James Knight <[email protected]>

Author: jdknight

doc/roles.rst

@@ -149,8 +149,9 @@ generated Confluence documents.
 
         :confluence_status:`WARNING <yellow>`
 
-    To tweak the style of a status macro to an outlined variant, adjust the
-    color enclosure to square brackets:
+    To tweak the style of a status macro to an outlined variant (if supported
+    by the configured Confluence editor), adjust the color enclosure to
+    square brackets:
 
     .. code-block:: rst