add+clarify cursor auto change detail; link issue

Author: tantek

css-ui-3/transition-pr-2017-11.md

@@ -27,7 +27,7 @@ First Tuesday or Thursday after a sucessful transition decision.
 ## Changes
 
 [Changes since the 2017-10-25 Candidate Recommendation](https://drafts.csswg.org/css-ui-3/#changes)
-<!-- no substantive chnges -->
+<!-- no substantive changes -->
 
 The following changes were judged by the CSS-WG to be within the bounds allowed for a CR->PR transition:
 
@@ -36,12 +36,16 @@ The following changes were judged by the CSS-WG to be within the bounds allowed
 * Allow, but stop requiring support for SVG images without intrinsic sizes for cursors (corresponding test update).
 * Align the spec with implementations, and make cursor: auto look like text over selectable text, and over editable elements (corresponding tests).
 
-These are normative changes, but they are small tweaks to take into account implementation feedback on a few subtleties of the features.
+These are normative changes, but they are all based on feedback from actual implementations on a few subtleties of how they had implemented the features.
 
-The first 3 changes cannot make an implementation that conformed to the spec prior to the changes become non conformant.
+The first 3 changes are are small tweaks and cannot make an implementation that conformed to the spec prior to the changes become non-conformant.
 
-The 4th one arguably could, but implementations were in violation of the spec prior to the change (and not willing to align),
-while we have more than 2 test-passing implementations after the change with the rest being willing to align.
+The 4th change could theoretically impact conformance, but in practice does not. 
+Zero known implementations (Gecko/Edge/Webkit/Blink/Presto) conformed with the previous wording (the [issue 1598 was openly reviewed and discussed](https://github.com/w3c/csswg-drafts/issues/1598) for several months), 
+while multiple implementations pass tests and interoperate with the change, 
+and all others for which conformance was not affected (did not pass before or after) agreed to update to conform to the new wording (over the old).
+
+Thus the editors and WG believe all four normative changes fall within the bounds allowed for a CR->PR transition.
 
 ## Requirements satisfied