docs/mm: Physical Memory: correct spelling in reference to CONFIG_PAGE_EXTENSION

Commit 5d8c5e430a63 ("docs/mm: Physical Memory: add structure, introduction
and nodes description") slips in a minor spelling mistake for the config
PAGE_EXTENSION.

Correct the config name in the physical-memory documentation.

Signed-off-by: Lukas Bulwahn <[email protected]>
Acked-by: Mike Rapoport (IBM) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>

0 files changed, 0 insertions, 0 deletions