fs: Remove aops->writepage

All callers and implementations are now removed, so remove the operation
and update the documentation to match.

Signed-off-by: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Link: https://lore.kernel.org/r/20250402150005.2309458-10-willy@infradead.org


Signed-off-by: Christian Brauner <brauner@kernel.org>