1) Fix a typo in EhcMoniteAsyncRequests.

2) Code cleanup.
3) Doxygen comment cleanup.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7428 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Bus/Pci/EhciDxe/UsbHcMem.c

@@ -2,7 +2,7 @@
 
   Routine procedures for memory allocate/free.
 
-Copyright (c) 2007, Intel Corporation
+Copyright (c) 2007 - 2009, Intel Corporation
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -124,8 +124,6 @@ FREE_BITARRAY:
   @param  Pool           The memory pool to free the block from.
   @param  Block          The memory block to free.
 
-  @return None.
-
 **/
 VOID
 UsbHcFreeMemBlock (
@@ -230,8 +228,6 @@ UsbHcAllocMemFromBlock (
   @param  Head           The head of the memory pool's block list.
   @param  Block          The memory block to insert.
 
-  @return None.
-
 **/
 VOID
 UsbHcInsertMemBlockToPool (
@@ -277,8 +273,6 @@ UsbHcIsMemBlockEmpty (
   @param  Head           The block list head of the memory's pool.
   @param  BlockToUnlink  The memory block to unlink.
 
-  @return None.
-
 **/
 VOID
 UsbHcUnlinkMemBlock (
@@ -459,8 +453,6 @@ UsbHcAllocateMem (
   @param  Mem            The memory to free.
   @param  Size           The size of the memory to free.
 
-  @return None.
-
 **/
 VOID
 UsbHcFreeMem (