[mediaqueries-5] Update inlined issues.

Author: fantasai

mediaqueries-5/Overview.bs

@@ -502,6 +502,12 @@ Detecting the desire for inverted colors on the display: the 'inverted-colors' f
 		</pre>
 	</div>
 
+	ISSUE: This is implemented in a wide variety of ways
+	some that do or do not preserve hue and/or images original colors
+	and there is no clear way for authors to react to this media query being true.
+	(See <a href="https://github.com/w3c/csswg-drafts/issues/3807">discussion</a>.)
+	Possible ways forward: add more values to reflect variations, or drop the feature.
+
 <h3 id="prefers-reduced-motion">
 Detecting the desire for less motion on the page: the 'prefers-reduced-motion' feature</h3>
 
@@ -558,9 +564,11 @@ Detecting the desire for reduced transparency on the page: the 'prefers-reduced-
 			Indicates that user has notified the system that they
 			prefer an interface that minimizes the amount of 
 			transparent or translucent layer effects.
-
 	</dl>
 
+	ISSUE: How does this interact with preferences around e.g. pattern fills and backgrounds?
+	They're not about transparency, but they also interfere with shape recognition.
+
 <h3 id="prefers-contrast">
 Detecting the desire for increased or decreased color contrast from elements on the page: the 'prefers-contrast' feature</h3>
 
@@ -596,8 +604,9 @@ Detecting the desire for increased or decreased color contrast from elements on
 
 	</dl>
 
-	Issue: Should we include 'forced-low' and 'forced-high' values? We don't necessarily want the
-	page to try to undo what the system might be enforcing.
+	ISSUE(2943): Split ''high'' into two levels,
+	“extremely high” (as used in MSFT's black-on-white high conrast theme)
+	and “increased (as implemented in Apple's Increased Contrast settings)?
 
 <h3 id="prefers-color-scheme">
 Detecting the desire for light or dark color schemes: the 'prefers-color-scheme' feature</h3>
@@ -641,9 +650,6 @@ Detecting the desire for light or dark color schemes: the 'prefers-color-scheme'
 	so that 'prefers-color-scheme' reflects preferences appropriate to the medium
 	rather than preferences take out of context.
 
-	Issue: Should we include 'forced-light' and 'forced-dark' values? We don't necessarily want the
-	page to try to undo what the system might be enforcing.
-
 <h2 id="changes" class="no-num">
 Changes</h2>
 <h3 id="changes-2017">