mempool: drop the file name in the top of file comment

Mentioning the name of the file is redundant, so drop it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20251113084022.1255121-12-hch@lst.de
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

Author: Christoph Hellwig

mm/mempool.c

@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- *  linux/mm/mempool.c
- *
  *  memory buffer pool support. Such pools are mostly used
  *  for guaranteed, deadlock-free memory allocations during
  *  extreme VM load.