[css-device-adapt] Adding two issues from MSFT feedback, to be addressed after pushing a new WD

Author: ChumpChief

css-device-adapt/Overview.bs

@@ -219,6 +219,8 @@ instance 'em's are resolved against the initial value of the
 <h3 id="min-max-width-desc">
 The 'min-width' and 'max-width' descriptors</h3>
 
+<p class="issue">min- and max- functionality can be achieved with media queries, should these be removed?</p>
+
 <pre class=descdef>
 Name: min-width
 For: @viewport
@@ -257,6 +259,8 @@ and the values have the following meanings:
         <a href="#constraining-procedure">constraining procedure</a>.
     </dd>
 
+    <p class="issue">The user-agent stylesheets recommended in the informative section don't adequately represent current implementation behaviors.  Should there be a more explicit mechanism for switching between UA default behavior and requesting the CSS pixel?</p>
+
     <dt><dfn><<length>></dfn></dt>
     <dd>
         A non-negative absolute or relative length.