mm: fix typo in struct pglist_data code comment

change "stat" to "start".

Link: https://lkml.kernel.org/r/20221207074011.GA151242@cloud
Fixes: c959924b0dc5 ("memory tiering: adjust hot threshold automatically")
Signed-off-by: Wang Yong <[email protected]>
Reviewed-by: "Huang, Ying" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
1 file changed