[css-pseudo-4] Move note.

Author: fantasai

css-pseudo-4/Overview.bs

@@ -305,6 +305,9 @@ The ::first-letter pseudo-element</h3>
       <img alt="Quotes that precede the first letter should be included." src="images/first-letter2.gif">
   </div>
 
+  Note: Note that the first <a>typographic letter unit</a> may in fact
+  be a digit, e.g., the “6” in “67 million dollars is a lot of money.”
+
   As explained in [[!CSS-TEXT-3]],
   a <a>typographic letter unit</a> can include more than one Unicode codepoint.
   For example, combining characters must be kept with their base character.
@@ -315,9 +318,6 @@ The ::first-letter pseudo-element</h3>
   The UA should tailor its definition of <a>typographic letter unit</a>
   to reflect the first-letter traditions of the ''::first-letter'' pseudo-element’s <em>containing block</em>’s content language.
 
-  Note: Note that the first <a>typographic letter unit</a> may in fact
-  be a digit, e.g., the “6” in “67 million dollars is a lot of money.”
-
   If the characters that would form the ''::first-letter''
   are not in the same element, such as <code>‘T</code> in <code>&lt;p&gt;‘&lt;em&gt;T...</code>,
   the user agent may create a ''::first-letter'' pseudo-element