[css-logical-1] Tweak issue wording

Author: fantasai

css-logical-1/Overview.bs

@@ -670,8 +670,9 @@ Four-Directional Shorthand Properties: the 'margin', 'padding', 'border-width',
   <p class="issue">
     The proposed syntax for this feature is <a href="https://github.com/w3c/csswg-drafts/issues/1282">under discussion</a>
     and is almost guaranteed to change from what is described here.
-    This section remains in the draft to promote discussion of alternatives
-    and to document the affected properties and expected impact on their interpretation
+    This section remains in the draft to promote discussion of alternatives,
+    to document the affected properties,
+    and to specify the expected impact on the interpretation
     of whatever syntactic switch is ultimately chosen.
 
   The following [[!CSS21]] shorthand properties