mm: fix typo in the comment of mod_zone_state()

mm: fix typo in the comment of mod_zone_state()

Use the proper function name, followed by parenthesis as usual.

Link: https://lkml.kernel.org/r/20260219234407.3261196-1-mssola@mssola.com
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
Acked-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>