Doc change to clarify the purpose of Layer.Grid.buffer.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@4313 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Grid.js

@@ -46,8 +46,8 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
     /**
      * APIProperty: buffer
      * {Integer} Used only when in gridded mode, this specifies the number of 
-     *           extra rows and colums of tiles which will surround the minimum
-     *           grid tiles to cover the map.
+     *           extra rows and colums of tiles on each side which will
+     *           surround the minimum grid tiles to cover the map.
      */
     buffer: 2,
 
@@ -304,7 +304,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      * bounds - {<OpenLayers.Bounds>}
      */
     initGriddedTiles:function(bounds) {
-       
+        
         // work out mininum number of rows and columns; this is the number of
         // tiles required to cover the viewport plus one for panning
         var viewSize = this.map.getSize();