doc: fix reference for finding replication slots to drop

Commit a70bce43fb added instructions on how to recover if PostgreSQL
refuses to issue new transaction IDs because of imminent wraparound,
but when describing how to find replication slots that should be dropped,
it referred to pg_stat_replication where it should have referenced
pg_replication_slots.

In passing, decorate references to views with <structname> tags.

Backpatch to all supported versions.

Reported-By: Sanjaya Waruna <[email protected]>
Author: Laurenz Albe <[email protected]>
Reviewed-by: Robert Treat <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: 
https://postgr.es/m/176767268098.1084085.10345048667224193...@wrigleys.postgresql.org
Backpatch-through: 14

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/87432b56b21d94a282c7fc2b7a12601421081d48

Modified Files
--------------
doc/src/sgml/maintenance.sgml | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

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