Remove trailing whitespace.

Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>

library/HTMLPurifier/Strategy.php

@@ -2,24 +2,24 @@
 
 /**
  * Supertype for classes that define a strategy for modifying/purifying tokens.
- * 
- * While HTMLPurifier's core purpose is fixing HTML into something proper, 
+ *
+ * While HTMLPurifier's core purpose is fixing HTML into something proper,
  * strategies provide plug points for extra configuration or even extra
  * features, such as custom tags, custom parsing of text, etc.
  */
 
- 
+
 abstract class HTMLPurifier_Strategy
 {
-    
+
     /**
      * Executes the strategy on the tokens.
-     * 
+     *
      * @param $tokens Array of HTMLPurifier_Token objects to be operated on.
      * @param $config Configuration options
      * @returns Processed array of token objects.
      */
     abstract public function execute($tokens, $config, $context);
-    
+
 }