[css-text-4] Handle non full-width punctuation in text-spacing *-adjacent

See w3c#6091

Author: frivoal

css-text-4/Overview.bs

@@ -8244,6 +8244,7 @@ Fullwidth Punctuation Collapsing</h4>
 			* a <a>fullwidth middle dot punctuation</a>
 			* an ideographic space (U+3000)
 			* a <a>fullwidth closing punctuation</a> of an equivalent or larger 'font-size'
+			* a character belonging to Unicode [=general category=] <code>Ps</code>
 
 			Otherwise set it full-width.
 		<li>
@@ -8252,6 +8253,7 @@ Fullwidth Punctuation Collapsing</h4>
 			* a <a>fullwidth middle dot punctuation</a>
 			* an ideographic space (U+3000)
 			* a <a>fullwidth opening punctuation</a> of a larger 'font-size'
+			* a character belonging to Unicode [=general category=] <code>Pe</code>
 
 			Otherwise set it full-width.
 	</ul>