[css-text-3] Mark Ogham space mark trimming as at-risk, tweak wording. It is deliberately ambiguous wrt options 1 & 2 in #4893 (comment)

Author: fantasai

css-text-3/Overview.bs

@@ -27,6 +27,7 @@ At Risk: the 'text-justify' property
 At Risk: the percentage values of 'word-spacing'
 At Risk: the 'hanging-punctuation' property
 At Risk: Writing-system specific adjustments to line-breaking
+At Risk: Trimming trailing Ogham space marks
 Ignored Vars: letter-spacing
 Status Text: This publication partially addresses the issues in the <a href="https://drafts.csswg.org/css-text-3/issues-lc-2013">disposition of comments</a> since the <a href="https://www.w3.org/TR/2013/WD-css-text-3-20131010/">October 2013 Last Call Working Draft</a>, and, while a marked improvement over the previous draft, is not considered to be entirely up-to-date at the time of publication. A completed dispostion of comments and corresponding draft will be published once the issues are fully addressed and reviewed by the CSSWG and Internationalization WG.
 WPT Path Prefix: /css/css-text/
@@ -1567,9 +1568,8 @@ Text Processing</h3>
       <li>A sequence at the end of a line
         of <a>collapsible</a> [=spaces=]
         is removed,
-        and any trailing U+1680 OGHAM SPACE MARK
-        is also removed
-        if it's 'white-space' property is ''white-space/normal'', ''nowrap'', or ''pre-line''.
+        as well as any trailing U+1680 OGHAM SPACE MARK
+        whose 'white-space' property is ''white-space/normal'', ''nowrap'', or ''pre-line''.
 
         <wpt>
           white-space/line-edge-white-space-collapse-001.html