Landing pull request 378. Comment typo in core.js.

More Details:
 - jquery#378

src/core.js

@@ -792,7 +792,7 @@ jQuery.extend({
 	},
 
 	// Mutifunctional method to get and set values to a collection
-	// The value/s can be optionally by executed if its a function
+	// The value/s can optionally be executed if it's a function
 	access: function( elems, key, value, exec, fn, pass ) {
 		var length = elems.length;