[css-ruby] Minor editorial updates to ruby text size

Author: Koji Ishii

css-ruby/Overview.html

@@ -1013,7 +1013,8 @@ <h3 class="heading settled" data-level=3.5 id=line-height><span class=secno>3.5.
 
 <h3 class="heading settled" data-level=3.6 id=ruby-size><span class=secno>3.6. </span><span class=content>Ruby Text Size</span><a class=self-link href=#ruby-size></a></h3>
 	<p>The <i>ruby annotations</i> are usually the half size of the <i>ruby base</i> as described in <a data-biblio-type=normative data-link-type=biblio href=#biblio-jlreq title=JLREQ>[JLREQ]</a>.
-		However, UA may increase the ratio when the text is small.
+		However, UA may increase the size when the text is small to make it readable,
+		or decrease if the text is large to avoid ruby text being too big.
 		Also, the 'ruby-position: inter-character' usually require different sizing 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>.
 

css-ruby/Overview.src.html

@@ -900,7 +900,8 @@ <h3 id="line-height">
 
 <h3 id="ruby-size">Ruby Text Size</h3>
 	<p>The <i>ruby annotations</i> are usually the half size of the <i>ruby base</i> as described in [[!JLREQ]].
-		However, UA may increase the size when the text is small.
+		However, UA may increase the size when the text is small to make it readable,
+		or decrease if the text is large to avoid ruby text being too big.
 		Also, the 'ruby-position: inter-character' usually require different sizing 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>.