[css-inline] Clarifications to dominant-baseline: auto

Author: fantasai

css-inline/Overview.bs

@@ -73,10 +73,12 @@ Dominant Baselines: the 'dominant-baseline' property</h3>
 			Equivalent to ''dominant-baseline/alphabetic'' in <a>horizontal writing modes</a>
 			and in <a>vertical writing modes</a>
 			when 'text-orientation' is ''sideways'', ''sideways-right'', or ''sideways-left''.
-			equivalent to ''dominant-baseline/central'' in <a>vertical writing modes</a>
+			Equivalent to ''dominant-baseline/central'' in <a>vertical writing modes</a>
 			when 'text-orientation' is ''mixed'' or ''upright''.
 
-			In SVG text, the origin point of glyphs is always handled as for ''dominant-baseline/central''
+			However, in SVG text, the origin point of glyphs
+			(used for coordinate-based glyph positioning)
+			is always handled as for ''dominant-baseline/central''
 			in <a>vertical writing modes</a>.
 
 		<dt><dfn>text-bottom</dfn>