Fix typo

Author: TDesjardins

lib/OpenLayers/Format/SLD/v1.js

@@ -52,7 +52,7 @@ OpenLayers.Format.SLD.v1 = OpenLayers.Class(OpenLayers.Format.Filter.v1_0_0, {
      * APIProperty: multipleSymbolizers
      * {Boolean} Support multiple symbolizers per rule.  Default is false.  if
      *     true, an OpenLayers.Style2 instance will be created to represent 
-     *     user styles instead of an OpenLayers.Style instace.  The 
+     *     user styles instead of an OpenLayers.Style instance.  The 
      *     OpenLayers.Style2 class allows collections of rules with multiple
      *     symbolizers, but is not currently useful for client side rendering.
      *     If multiple symbolizers is true, multiple FeatureTypeStyle elements