Standardize "read-ahead advice" terminology.

Thomas Munro <tmunro@postgresql.org>

Commit: 813fde73d4dd4fab1b7bde99ceaa47dd8437c21e
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2024-09-03T22:28:53Z
Releases: 18.0
Standardize "read-ahead advice" terminology.

Commit 6654bb920 added macOS's equivalent of POSIX_FADV_WILLNEED, and
changed some explicit references to posix_fadvise to use this more
general name for the concept.  Update some remaining references.

Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/0827edec-1317-4917-a186-035eb1e3241d%40eisentraut.org

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