[css-text-3] Allow distribute to be a legacy value alias w3c#7322

For some engines this is easier; for some it's harder.
Spec allows either, since it's a compat alias and it doesn't matter.

Author: fantasai

css-text-3/Overview.bs

@@ -5249,6 +5249,7 @@ Justification Method: the 'text-justify' property</h3>
 			UAs must also support the alternate keyword <dfn>distribute</dfn>
 			which must compute to ''inter-character'',
 			thus having the exact same meaning and behavior.
+			UAs may treat this as a [=legacy value alias=].
 
 			<wpt>
 			text-justify/text-justify-003.html
@@ -7918,6 +7919,9 @@ Recent Changes</h3>
 	* Define ''text-align/match-parent'' on the [=root element=] to compute to ''text-align/start''
 		instead of computing against the [=principal writing mode=].
 		(<a href="https://github.com/w3c/csswg-drafts/issues/6542">Issue 6542</a>)
+	* Allow ''text-justify/distribute'' to be implemented as a [=legacy value alias=],
+		since this is easier for some engines and does not matter for compatibility.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/7322">Issue 7322</a>)
 
 	In addition there have been some minor editorial fixes.