doc: Update outdated descriptions of wal_status in pg_replication_slots.

The documentation for pg_replication_slots previously mentioned only
max_slot_wal_keep_size as a condition under which the wal_status column
could show unreserved or lost. However, since commit be87200,
replication slots can also be invalidated due to horizon or wal_level,
and since commit ac0e33136ab, idle_replication_slot_timeout can also
trigger this state.

This commit updates the description of the wal_status column to
reflect that max_slot_wal_keep_size is not the only cause of the lost state.

Back-patched to v16, where the additional invalidation cases were introduced.

Author: Fujii Masao <[email protected]>
Reviewed-by: Hayato Kuroda <[email protected]>
Reviewed-by: Nisha Moond <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 16

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