[css-ruby] Fixed Default Style Sheet additional rules to include rtc

Author: kojiishi

css-ruby/Overview.html

@@ -1016,7 +1016,8 @@ <h3 class="heading settled" data-level=3.6 id=ruby-size><span class=secno>3.6. <
 		However, UA may increase the font size when the it is too small to read,
 		or decrease if the text is too large to avoid ruby annotation being too large.
 		Also, the 'ruby-position: inter-character' usually require different font size such as 25% or 33%.
-	<p>This level of the specification does not provide a mechanism to control the size of <i>ruby annotations</i>.
+	<p>This level of the specification does not provide a mechanism to control the size of <i>ruby annotations</i>
+		relative to <i>ruby base</i>.
 
 <h2 class="heading settled" data-level=4 id=ruby-props><span class=secno>4. </span><span class=content>
 Ruby Formatting Properties</span><a class=self-link href=#ruby-props></a></h2>
@@ -1428,7 +1429,7 @@ <h3 class="no-num heading settled" id=default-ua-ruby><span class=content>
 ruby, rb, rt, rbc, rtc { unicode-bidi: isolate; }</pre>
 
 	<p>Additional rules for UAs supporting the relevant features of <a data-biblio-type=informative data-link-type=biblio href=#biblio-css3-text-decor title=CSS3-TEXT-DECOR>[CSS3-TEXT-DECOR]</a> and <a data-biblio-type=informative data-link-type=biblio href=#biblio-css3-fonts title=CSS3-FONTS>[CSS3-FONTS]</a>:
-<pre>rt { font-variant-east-asian: ruby; text-emphasis: none; }</pre>
+<pre>rtc, rt { font-variant-east-asian: ruby; text-emphasis: none; }</pre>
 
 	<p class=note role=note>Authors should not use the above rules;
 	a UA that supports ruby layout should provide these by default.

css-ruby/Overview.src.html

@@ -1518,7 +1518,7 @@ <h3 id="default-ua-ruby" class="no-num">
 <!--	-->ruby, rb, rt, rbc, rtc { unicode-bidi: isolate; }</pre>
 
 	<p>Additional rules for UAs supporting the relevant features of [[CSS3-TEXT-DECOR]] and [[CSS3-FONTS]]:
-	<pre>rt { font-variant-east-asian: ruby; text-emphasis: none; }</pre>
+	<pre>rtc, rt { font-variant-east-asian: ruby; text-emphasis: none; }</pre>
 
 	<p class="note">Authors should not use the above rules;
 	a UA that supports ruby layout should provide these by default.