[css-sizing-3] Fix typo

Author: frivoal

css-sizing-3/Overview.bs

@@ -53,7 +53,7 @@ Module interactions</h3>
 	<p>This module extends the 'width', 'height', 'min-width', 'min-height', 'max-width', 'max-height', and 'column-width'
 	features defined in [[!CSS2]] chapter 10 and in [[!CSS3COL]]
 
-	<p>The definition of the 'box-sizing' property in module supersedes the one in [[CSS-UI-3]].
+	<p>The definition of the 'box-sizing' property in this module supersedes the one in [[CSS-UI-3]].
 
 <h3 id="values">
 Values</h3>