[css-align] Remove some issues that are no longer relevant.

Author: fantasai

css-align/Overview.bs

@@ -1607,9 +1607,6 @@ Determining the Baselines of a Box</h2>
 		whichever is orthogonal to the box’s own 'writing-mode'.
 		<!-- This pairing is chosen because the most likely case for this situation is CJK. -->
 
-	Issue: Maybe these things are wrong?
-	CSS 2.1 is really weird about baseline alignment.
-
 	For the purposes of finding the baselines of a box,
 	it and all its in-flow descendants with a scrolling mechanism (see the 'overflow' property)
 	must be considered as if scrolled to their origin.
@@ -1618,8 +1615,6 @@ Determining the Baselines of a Box</h2>
 	is past a box's end (start) border edge,
 	its position is clamped to that border edge.
 
-	ISSUE: This reflects the latest CSS2.1 errata, however see also discussion of an <a href="https://github.com/w3c/csswg-drafts/issues/766">alternate solution</a> that was previously drafted here.
-
 <h3 id='baseline-terms'>
 Baseline Alignment Grouping</h3>