Remove extraneous comment that also happened to have a fatal error.

Author: tabatkins

css-typed-om/Overview.bs

@@ -218,7 +218,7 @@ is initialized differently depending on where the {{CSSStyleValue}} is used
 [[#declared-stylepropertymap-objects]], and
 [[#inline-stylepropertymap-objects]]).
 
-All properties stored on the [=property model=] in {{StylePropertyMapReadOnly}} are [=ASCII case-insensitive=] within the ASCII range (i.e., [a-z] and [A-Z] are equivalent).
+All properties stored on the [=property model=] in {{StylePropertyMapReadOnly}} are [=ASCII case-insensitive=].
 
 <div class='note'>
 The sequence of {{CSSStyleValue}}s associated with a property do
@@ -300,7 +300,7 @@ The <dfn method for=StylePropertyMap>append(DOMString <var>property</var>,
 
     3. If {{StylePropertyMap}}’s [=property model=] contains an entry for |property|,
         return the first value found in that entry.
-    
+
     4. Else, return `null`.
 </div>