MM documentation: add "Unaccepted" meminfo entry

Commit dcdfdd4 ("mm: Add support for unaccepted memory") added a
entry to meminfo but did not document it in the proc.rst file.

This counter tracks the amount of "Unaccepted" guest memory for some
Virtual Machine platforms, such as Intel TDX or AMD SEV-SNP.

Add the missing entry in the documentation.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Nico Pache <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Andrii Nakryiko <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Jeff Xu <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Pasha Tatashin <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: xu xin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: PacheNico

Documentation/filesystems/proc.rst

@@ -1081,6 +1081,7 @@ Example output. You may not have all of these fields.
     FilePmdMapped:         0 kB
     CmaTotal:              0 kB
     CmaFree:               0 kB
+    Unaccepted:            0 kB
     Balloon:               0 kB
     HugePages_Total:       0
     HugePages_Free:        0
@@ -1256,6 +1257,8 @@ CmaTotal
               Memory reserved for the Contiguous Memory Allocator (CMA)
 CmaFree
               Free remaining memory in the CMA reserves
+Unaccepted
+              Memory that has not been accepted by the guest
 Balloon
               Memory returned to Host by VM Balloon Drivers
 HugePages_Total, HugePages_Free, HugePages_Rsvd, HugePages_Surp, Hugepagesize, Hugetlb