docs/mm: hugetlbfs_reserv: fix a reference to a file that doesn't exist

kbuild reports:

>> Warning: Documentation/mm/hugetlbfs_reserv.rst references a file that doesn't exist: Documentation/mm/hugetlbpage.rst
>> Warning: Documentation/translations/zh_CN/mm/hugetlbfs_reserv.rst references a file that doesn't exist: Documentation/mm/hugetlbpage.rst

Fix the filename to be 'Documentation/admin-guide/mm/hugetlbpage.rst'.

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202302231854.sKlCmx9K-lkp@intel.com/
Fixes: ee86588 ("docs/mm: remove useless markup")
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Link: https://lore.kernel.org/r/20230224100306.2287696-2-rppt@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Author: rppt

Documentation/mm/hugetlbfs_reserv.rst

@@ -5,10 +5,10 @@ Hugetlbfs Reservation
 Overview
 ========
 
-Huge pages as described at Documentation/mm/hugetlbpage.rst are typically
-preallocated for application use.  These huge pages are instantiated in a
-task's address space at page fault time if the VMA indicates huge pages are
-to be used.  If no huge page exists at page fault time, the task is sent
+Huge pages as described at Documentation/admin-guide/mm/hugetlbpage.rst are
+typically preallocated for application use.  These huge pages are instantiated
+in a task's address space at page fault time if the VMA indicates huge pages
+are to be used.  If no huge page exists at page fault time, the task is sent
 a SIGBUS and often dies an unhappy death.  Shortly after huge page support
 was added, it was determined that it would be better to detect a shortage
 of huge pages at mmap() time.  The idea is that if there were not enough

Documentation/translations/zh_CN/mm/hugetlbfs_reserv.rst

@@ -15,7 +15,8 @@ Hugetlbfs 预留
 概述
 ====
 
-Documentation/mm/hugetlbpage.rst 中描述的巨页通常是预先分配给应用程序使用的。如果VMA指
+Documentation/admin-guide/mm/hugetlbpage.rst
+中描述的巨页通常是预先分配给应用程序使用的 。如果VMA指
 示要使用巨页，这些巨页会在缺页异常时被实例化到任务的地址空间。如果在缺页异常
 时没有巨页存在，任务就会被发送一个SIGBUS，并经常不高兴地死去。在加入巨页支
 持后不久，人们决定，在mmap()时检测巨页的短缺情况会更好。这个想法是，如果