[css-text-3][css-text-4] Add Hanifi Rohingya to Appendix D #9984

Author: fantasai

css-text-3/Overview.bs

@@ -7467,6 +7467,7 @@ Scripts and Spacing</h2>
 			between their letters for either justification or 'letter-spacing'.
 			The following [=Unicode scripts=] are included:
 			Arabic,
+			Hanifi Rohingya,
 			Mandaic,
 			Mongolian,
 			N’Ko,