[css-text-3] Clean up notes/cross-references.

Author: fantasai

css-text-3/Overview.bs

@@ -2012,9 +2012,9 @@ Order of Operations</h4>
         are treated as having an <a>East Asian Width property</a> of
         <code>Ambiguous</code>.
 -->
-      <p class="note">Note: The white space processing rules have already
-        removed any [=tabs=] and [=spaces=] after the [=segment break=] before these checks
-        take place.</p>
+      Note: The white space processing rules have already
+        removed any [=tabs=] and [=spaces=] around the [=segment break=]
+        before these checks take place.
 
       <div class="example">
         The purpose of the segment break transformation rules
@@ -2065,6 +2065,10 @@ Order of Operations</h4>
         (although IE does in some cases transform the break,
         and Firefox follows the first two bullet points).</p>
 
+  ISSUE(5086): Should space-discarding punctuation have a stronger influence over mismatched before/after contexts?
+
+  ISSUE(5017): Should we classify punctuation and/or symbols as a category of space-ambiguous characters? (Currently spaces are discarded only if both sides are space-discarding; ambiguous characters would defer to the other side.)
+
   <h3 id="tab-size-property" caniuse="css3-tabsize" oldids="tab-size">
     Tab Character Size: the 'tab-size' property</h3>
 
@@ -5383,9 +5387,12 @@ Space-Discarding Unicode Characters</h2>
 
   <p><em>This appendix is normative.</em></p>
 
+  Characters belonging to the <dfn>space-discarding character set</dfn>
+  bias adjacent [=segment breaks=] towards
+  being discarded rather than being transformed into U+0020 SPACE
+  when collapsing white space, see [[#line-break-transform]].
   Characters from the following blocks in Unicode 13.0 [[UNICODE]]
-  are considered part of the <dfn>space-discarding character set</dfn>
-  for the purpose of [[#line-break-transform]]:
+  are considered part of the [=space-discarding character set=]:
 
   <table class=data>
     <caption>Space-discarding Unicode Bocks</caption>
@@ -5486,10 +5493,9 @@ Space-Discarding Unicode Characters</h2>
       <td>CJK Unified Ideographs Extension G
   </table>
 
-  ISSUE(5017): Should we classify punctuation / symbols as a category of space-ambiguous characters? (Currently spaces are discarded only if both sides are space-discarding; ambiguous characters would discard if the other side is space-discarding.)
-
   For future revisions of [[UNICODE]],
-  any new block whose allocated contents comprise at least 50% codepoints belonging to the
+  any new block whose initially-allocated contents comprise
+  at least 50% codepoints belonging to the
   Han, Hiragana, Katakana, or Yi script
   shall also be considered part of the [=space-discarding character set=].