[css-shapes] fix ambiguity on threshold value

Author: astearns

css-shapes/Overview.html

@@ -12,7 +12,7 @@
    rel=dcterms.rights>
   <meta content="CSS Shapes Module Level 1" name=dcterms.title>
   <meta content=text name=dcterms.type>
-  <meta content=2013-10-02 name=dcterms.date>
+  <meta content=2013-10-03 name=dcterms.date>
   <meta content="Vincent Hardy" name=dcterms.creator>
   <meta content="Rossen Atanassov" name=dcterms.creator>
   <meta content="Alan Stearns" name=dcterms.creator>
@@ -51,7 +51,7 @@
 
    <h1 id=css-shapes-module>CSS Shapes Module Level 1</h1>
 
-   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 2 October 2013</h2>
+   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 3 October 2013</h2>
 
    <dl>
     <dt>This version:
@@ -888,8 +888,8 @@ <h3 id=shape-image-threshold-property><span class=secno>5.2. </span>The
 
    <dd> Sets the threshold used for extracting a shape from an image. The
     shape is defined by the pixels whose alpha value is greater than the
-    threshold. Any values outside the range 0.0 (fully transparent) to 1.0
-    (fully opaque) will be clamped to this range.
+    threshold. A threshold value outside the range 0.0 (fully transparent) to
+    1.0 (fully opaque) will be clamped to this range.
   </dl>
 
   <div class=note>

css-shapes/Overview.src.html

@@ -761,7 +761,7 @@ <h3 id="shape-image-threshold-property">The 'shape-image-threshold' Property</h3
             The shape is defined 
             by the pixels whose alpha value 
             is greater than the threshold. 
-            Any values outside the range 
+            A threshold value outside the range 
             0.0 (fully transparent) 
             to 1.0 (fully opaque) 
             will be clamped to this range.