fixing typo

Author: dret

css-pseudo/Overview.bs

@@ -204,7 +204,7 @@ Inheritance and the ''::first-line'' Pseudo-element</h4>
   During CSS inheritance, the portion of a child element that occurs on the first line
   only inherits properties applicable to the ''::first-line'' pseudo-element
   from the ''::first-line'' pseudo-element.
-  For all other properties inheritence is
+  For all other properties inheritance is
   from the non-pseudo-element parent of the first line pseudo element.
   (The portion of a child element that does not occur on the first line
   always inherits from the parent of that child.)