Fix markdown syntax for ruleset note (#56774)

Author: patrick-knight

data/reusables/repositories/ruleset-beta-note.md

@@ -1,2 +1,2 @@
-> [!NOTE]
-> {% ifversion ghes > 3.16 %}Only changes made to a ruleset after you have upgraded to {% data variables.product.prodname_ghe_server %} 3.17.0, or a later version, are included in the ruleset history.{% endif %}
+> {% ifversion ghes > 3.16 %}[!NOTE]
+> Only changes made to a ruleset after you have upgraded to {% data variables.product.prodname_ghe_server %} 3.17.0, or a later version, are included in the ruleset history.{% endif %}