[css-text] List ASCII quotes explicitly, since they're missing from Pi/Pf per hyatt.

Author: fantasai

css-text/Overview.bs

@@ -1990,11 +1990,13 @@ Cursive Scripts</h4>
         <dd>An opening bracket or quote at the start of the
           <a href="https://www.w3.org/TR/CSS21/selector.html#first-line-pseudo">first
           formatted line</a> of an element <a>hangs</a>.
-          This applies to all characters in the Unicode categories Ps, Pf, Pi.</dd>
+          This applies to all characters in the Unicode categories Ps, Pf, Pi
+          plus the ASCII quote marks “'” U+0027 and “"” U+0022.
       <dt><dfn>last</dfn></dt>
         <dd>A closing bracket or quote at the end of the
           last formatted line of an element <a>hangs</a>.
-          This applies to all characters in the Unicode categories Pe, Pf, Pi.</dd>
+          This applies to all characters in the Unicode categories Pe, Pf, Pi
+          plus the ASCII quote marks “'” U+0027 and “"” U+0022.
       <dt><dfn>force-end</dfn></dt>
         <dd>A <a>stop or comma</a> at the end of a line <a>hangs</a>.</dd>
       <dt><dfn>allow-end</dfn></dt>