[css-text-3] Adjust wording around kerning vs letter-spacing to not imply an order of operations, just addition. w3c#3816

Author: fantasai

css-text-3/Overview.bs

@@ -3385,8 +3385,9 @@ Word Spacing: the 'word-spacing' property</h3>
   between adjacent <a>typographic character units</a>.
   Letter-spacing is applied after
   <a href="https://www.w3.org/TR/css-writing-modes/#text-direction">bidi reordering</a> [[CSS-WRITING-MODES-3]]
-  and <a href="https://www.w3.org/TR/css-fonts/#font-kerning-prop">kerning</a> [[CSS-FONTS-3]]
-  and is in addition to any 'word-spacing'.
+  and is in addition to
+  <a href="https://www.w3.org/TR/css-fonts/#font-kerning-prop">kerning</a> [[CSS-FONTS-3]]
+  and 'word-spacing'.
   Depending on the justification rules in effect,
   user agents may further increase or decrease the space between <a>typographic character units</a>
   in order to <a href="#text-justify-property">justify text</a>.