memremap.h: correct an error in a comment

It tried to send me off to memory_hotplug.h for an enum that is a few
lines above...

Link: https://lkml.kernel.org/r/dba0f5f01162d6fa16e4da2a9fede7f97080e92d.1707179960.git.john@groves.netSigned-off-by: John Groves <john@groves.net>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/memremap.h

@@ -109,7 +109,7 @@ struct dev_pagemap_ops {
  * @altmap: pre-allocated/reserved memory for vmemmap allocations
  * @ref: reference count that pins the devm_memremap_pages() mapping
  * @done: completion for @ref
- * @type: memory type: see MEMORY_* in memory_hotplug.h
+ * @type: memory type: see MEMORY_* above in memremap.h
  * @flags: PGMAP_* flags to specify defailed behavior
  * @vmemmap_shift: structural definition of how the vmemmap page metadata
  *      is populated, specifically the metadata page order.