[css-values-5] Remove issue about direct length-with-keyword interpolation, now that we have interpolate-size

Author: tabatkins

css-values-5/Overview.bs

@@ -2094,10 +2094,6 @@ explicitly write a ''calc-size()''
 with the value in its [=calc-size basis=],
 like ''calc-size(50%, size)''.
 
-Issue: Or is it compatible to just allow direct interpolation
-between keywords and fixed lengths,
-even without an explicit ''calc-size()'' being used on one size?
-This would be nice, but compat analysis is required.
 
 <h3 id=interpolate-size>
 Interpolating sizing keywords: the 'interpolate-size' property</h3>
@@ -2115,8 +2111,8 @@ We suggest doing this whenever compatibility isn't an issue.
 
 <pre class="propdef">
 Name: interpolate-size
-Value: ''numeric-only'' | ''allow-keywords''
-Initial: ''numeric-only''
+Value: numeric-only | allow-keywords
+Initial: numeric-only
 Inherited: yes
 Applies to: all elements
 Computed value: as specified