mm: fix some kernel-doc comments

Add description of @mm_wr_locked and @mm.
to silence the warnings:

mm/memory.c:1716: warning: Function parameter or member 'mm_wr_locked' not described in 'unmap_vmas'
mm/memory.c:5110: warning: Function parameter or member 'mm' not described in 'mm_account_fault'

Link: https://lkml.kernel.org/r/20230707090034.125511-1-yang.lee@linux.alibaba.comSigned-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/memory.c

@@ -1697,6 +1697,7 @@ static void unmap_single_vma(struct mmu_gather *tlb,
  * @vma: the starting vma
  * @start_addr: virtual address at which to start unmapping
  * @end_addr: virtual address at which to end unmapping
+ * @mm_wr_locked: lock flag
  *
  * Unmap all pages in the vma list.
  *
@@ -5084,7 +5085,7 @@ static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma,
 
 /**
  * mm_account_fault - Do page fault accounting
- *
+ * @mm: mm from which memcg should be extracted. It can be NULL.
  * @regs: the pt_regs struct pointer.  When set to NULL, will skip accounting
  *        of perf event counters, but we'll still do the per-task accounting to
  *        the task who triggered this page fault.