[css-ruby] Update Changes section

Author: fantasai

css-ruby/Overview.html

@@ -2111,9 +2111,26 @@ <h2 class=no-num id=changes> Changes</h2>
    <dt>Remove unused values of ‘<a href="#ruby-align"><code
     class=property>ruby-align</code></a>’.
 
-   <dd> ‘<code class=property>left</code>’, ‘<code
-    class=property>right</code>’, and ‘<code class=property>end</code>’
-    are not needed.
+   <dd> ‘<code class=css>left</code>’, ‘<code
+    class=css>right</code>’, and ‘<code class=css>end</code>’ are not
+    needed.
+
+   <dt>Replace ‘<code class=css>auto</code>’, ‘<code
+    class=css>distribute-letter</code>’, and ‘<code
+    class=css>distribute-space</code>’ with ‘<code
+    class=css>space-between</code>’ and ‘<code
+    class=css>space-around</code>’.
+
+   <dd> The ‘<code class=css>auto</code>’ value relied on inspecting
+    content to determine behavior; this can be avoided by just using ‘<code
+    class=css>space-around</code>’ with standard justification rules (which
+    allow spacing between CJK but not between Latin). Replaced ‘<code
+    class=css>distribute-letter</code>’ and ‘<code
+    class=css>distribute-space</code>’ with ‘<code
+    class=css>space-between</code>’ and ‘<code
+    class=css>space-around</code>’ for consistency with Flexbox
+    distribution keywords and to avoid links to the definition of ‘<code
+    class=css>text-justify: distribute</code>’.
 
    <dt>Added ‘<a href="#ruby-merge"><code
     class=property>ruby-merge</code></a>’ property to control jukugo

css-ruby/Overview.src.html

@@ -1596,7 +1596,16 @@ <h2 class="no-num" id="changes">
 
 		<dt>Remove unused values of 'ruby-align'.
 		<dd>
-			'left', 'right', and 'end' are not needed.
+			''left'', ''right'', and ''end'' are not needed.
+
+		<dt>Replace ''auto'', ''distribute-letter'', and ''distribute-space'' with ''space-between'' and ''space-around''.
+		<dd>
+			The ''auto'' value relied on inspecting content to determine behavior;
+			this can be avoided by just using ''space-around'' with standard justification rules
+			(which allow spacing between CJK but not between Latin).
+			Replaced ''distribute-letter'' and ''distribute-space'' with
+			''space-between'' and ''space-around'' for consistency with Flexbox distribution keywords
+			and to avoid links to the definition of ''text-justify: distribute''.
 
 		<dt>Added 'ruby-merge' property to control jukugo rendering.
 		<dd>