Rename XLogData protocol message to WALData

Álvaro Herrera <alvherre@kurilemu.de>

Commit: 07684443b1e03cd56a6a9dee589f5de91e3f9a34
Author: Álvaro Herrera <alvherre@kurilemu.de>
Date: 2025-08-04T12:03:01Z
Rename XLogData protocol message to WALData

This name is only used as documentation, and using this name is
consistent with its byte being a 'w'.  Renaming it would also make the
use of a symbolic name based on the word "WAL" rather than the obsolete
"XLog" term more consistent, per future commits along the lines of
37c7a7eeb6d1, 4a68d5008869, f4b54e1ed985.

Discussion: https://postgr.es/m/aIECfYfevCUpenBT@nathan

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