[css-fonts-3] finish off changes list

Author: svgeesus

css-fonts-3/Fonts.src.html

@@ -4481,6 +4481,9 @@ <h3 class="no-num" id="recent-changes">
     <li>CSSFontFeatureValuesRule interface moved to Fonts 4</li>
     <li>CSSFontFaceRule interface reverted to the widely implemented one
       from DOM Level 2 style</li>
+      <li>clarified that generic font families may be composite faces</li>
+    <li>clarified that "first available font" is one that would
+      match the U+0020 (space) character</li>
     <li>clarified how small-caps synthesis interacts with 'font-feature-settings'</li>
     <li>all CSS keywords marked as invalid font family names</li>
     <li>clarified that 'font-synthesis' is not reset by the 'font' shorthand.</li>
@@ -4489,10 +4492,12 @@ <h3 class="no-num" id="recent-changes">
       show up in the DOM, but don't affect font selection</li>
     <li>clarified conventional ratio range for the relative sizes when they're
       not modifying an absolute keyword size</li>
-
+    <li>clarified that for both font-variation-settings and font-feature-settings, the computed value
+      is a map (and thus specified dupes are removed)</li>
     <li>added omitted 'font-variant-position' values to <span title="font-variant!!property">'font-variant'</span> shorthand</li>
     <li>made negative values for font-size-adjust invalid, along with negative percentage font-size values</li>
     <li>removed the requirement that user agents use OS/2 table subscript/superscript metrics</li>
+    <li>added informative link to CSS Text order of operations</li>
     <li>minor editorial cleanups</li>
   </ul>