Fix #2205 by referencing RFC8081 for collection fragment syntax

Author: svgeesus

css-fonts-3/Fonts.src.html

@@ -1618,15 +1618,15 @@ <h3 id="src-desc">Font reference: the <a href="#descdef-src">src</a> descriptor<
 a reference to the first defined font is implied.  Similarly, font
 container formats that can contain more than one font must load one
 and only one of the fonts for a given <code>@font-face</code> rule. Fragment
-identifiers are used to indicate which font to load.  If a container
-format lacks a defined fragment identifier scheme, implementations
-should use a simple 1-based indexing scheme (e.g. "font-collection#1"
-for the first font, "font-collection#2" for the second font).</p>
+identifiers are used to indicate which font to load; these use the PostScript
+name of the font as defined in [[!RFC8081]].  </p>
 
 <pre>
-src: url(fonts/simple.woff);   /* load simple.woff relative to stylesheet location */
-src: url(/fonts/simple.woff);  /* load simple.woff from absolute location */
-src: url(fonts.svg#simple);    /* load SVG font with id 'simple' */
+src: url(fonts/simple.woff);       /* load simple.woff relative to stylesheet location */
+src: url(/fonts/simple.woff);      /* load simple.woff from absolute location */
+src: url(fonts/coll.otc#foo);      /* load font foo from collection coll.otc
+src: url(fonts/coll.woff2#foo);    /* load font foo from woff2 collection coll.woff2
+src: url(fonts.svg#simple);        /* load SVG font with id 'simple' */
 </pre>
 
 <p>External references consist of a URL, followed by an optional hint
@@ -1660,9 +1660,14 @@ <h3 id="src-desc">Font reference: the <a href="#descdef-src">src</a> descriptor<
 <tbody>
 <tr>
   <th>"woff"</th>
-  <td><a href="https://www.w3.org/TR/WOFF/">WOFF (Web Open Font Format)</a></td>
+  <td><a href="https://www.w3.org/TR/WOFF/">WOFF 1.0 (Web Open Font Format)</a></td>
   <td>.woff</td>
 </tr>
+<tr>
+  <th>"woff2"</th>
+  <td><a href="https://www.w3.org/TR/WOFF2/">WOFF 2.0 (Web Open Font Format)</a></td>
+  <td>.woff2</td>
+</tr>
 <tr>
   <th>"truetype"</th>
   <td><a href="https://www.microsoft.com/typography/otspec/default.htm">TrueType</a></td>
@@ -2719,7 +2724,7 @@ <h2 id="font-rend-props">Font Feature Properties</h2>
 stylistic font features.</p>
 
 <h3 id="glyph-selection-positioning">Glyph selection and positioning</h3>
-	
+
 	<p>This section is non-normative</p>
 
 <p>Simple fonts used for displaying Latin text use a very basic