[css-values] Additional wording tweak to definitions of ch and ic to emphasize conceptual definition over implementation method. #7577

Author: fantasai

css-values-3/Overview.bs

@@ -1116,7 +1116,7 @@ Font-relative Lengths: the ''em'', ''ex'', ''ch'', ''rem'' units</h4>
 		<dt><dfn id="ch" lt="ch">ch unit</dfn>
 		<dd>
 			Represents the typical <a>advance measure</a> of European alphanumeric characters,
-			and defined as the used <a>advance measure</a> of the “0” (ZERO, U+0030) glyph
+			and measured as the used <a>advance measure</a> of the “0” (ZERO, U+0030) glyph
 			in the font used to render it.
 			(The <dfn dfn>advance measure</dfn> of a glyph is its advance width or height,
 			whichever is in the inline axis of the element.)

css-values-4/Overview.bs

@@ -1766,7 +1766,7 @@ Font-relative Lengths: the ''em'', ''rem'', ''ex'', ''rex'', ''cap'', ''rcap'',
 		<dt><dfn id="ch" lt="ch">ch unit</dfn>
 		<dd>
 			Represents the typical <a>advance measure</a> of European alphanumeric characters,
-			and defined as the used <a>advance measure</a> of the “0” (ZERO, U+0030) glyph
+			and measured as the used <a>advance measure</a> of the “0” (ZERO, U+0030) glyph
 			in the font used to render it.
 			(The <dfn dfn>advance measure</dfn> of a glyph is its advance width or height,
 			whichever is in the inline axis of the element.)
@@ -1809,7 +1809,7 @@ Font-relative Lengths: the ''em'', ''rem'', ''ex'', ''rex'', ''cap'', ''rcap'',
 		<dt><dfn id="ic" lt="ic">ic unit</dfn>
 		<dd>
 			Represents the typical <a>advance measure</a> of CJK letters,
-			and defined as the used <a>advance measure</a> of the “水” (CJK water ideograph, U+6C34) glyph
+			and measured as the used <a>advance measure</a> of the “水” (CJK water ideograph, U+6C34) glyph
 			found in the font used to render it.
 
 			Note: This measurement is a typically an exact measure