Synchronize interface function comment from declaration in library class header file to implementation in library instance.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6952 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/DxeRuntimePciExpressLib/PciExpressLib.c

@@ -249,9 +249,13 @@ GetPciExpressAddress (
 }
 
 /**
-  Register a PCI device so PCI configuration registers may be accessed after 
+  Registers a PCI device so PCI configuration registers may be accessed after 
   SetVirtualAddressMap().
   
+  Registers the PCI device specified by Address so all the PCI configuration 
+  registers associated with that PCI device may be accessed after SetVirtualAddressMap() 
+  is called.
+  
   If Address > 0x0FFFFFFF, then ASSERT().
 
   @param  Address Address that encodes the PCI Bus, Device, Function and
@@ -1453,7 +1457,7 @@ PciExpressBitFieldAndThenOr32 (
   @param  Size          Size in bytes of the transfer.
   @param  Buffer        Pointer to a buffer receiving the data read.
 
-  @return Size
+  @return Size read data from StartAddress.
 
 **/
 UINTN
@@ -1552,7 +1556,7 @@ PciExpressReadBuffer (
   @param  Size          Size in bytes of the transfer.
   @param  Buffer        Pointer to a buffer containing the data to write.
 
-  @return Size
+  @return Size written to StartAddress.
 
 **/
 UINTN