MdeModulePkg/XhciDxe: Make comments align with function

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>

MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c

@@ -991,6 +991,7 @@ XhcFreeSched (
 /**
   Check if the Trb is a transaction of the URB.
 
+  @param Xhc    The XHCI Instance.
   @param Trb    The TRB to be checked
   @param Urb    The URB to be checked.