[css-align] Stop angsting over which baseline alignment to use; nobody's commented, so our choice is probably fine.

Author: tabatkins

css-align/Overview.bs

@@ -314,9 +314,6 @@ Baseline Alignment: the ''baseline'' and ''last-baseline'' keywords</h3>
 	only <a>baseline self-alignment</a> is honored in that axis;
 	the content-alignment in that axis must be treated as ''start''.
 
-	Issue: The previous paragraph is fairly arbitrary.
-	Need some experience to make sure it's the correct choice out of the two possibilities.
-
 	<p class='issue'>Add example images here.
 
 	Note: The 'vertical-align' property will also need a ''first-baseline'' value