Update or add comments to files and functions for use by Doxygen.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12090 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/LibC/Uefi/Devices/Console/daConsole.c

@@ -401,12 +401,14 @@ da_ConOpen(
      (DevNode  == NULL))
   {
     EFIerrno = RETURN_INVALID_PARAMETER;
+    errno = EINVAL;
     return -1;
   }
   Stream = (ConInstance *)DevNode->InstanceList;
   // Quick check to see if Stream looks reasonable
   if(Stream->Cookie != CON_COOKIE) {    // Cookie == 'IoAb'
     EFIerrno = RETURN_INVALID_PARAMETER;
+    errno = EINVAL;
     return -1;    // Looks like a bad This pointer
   }
   gMD->StdIo[Stream->InstanceNum] = Stream;