doc: add docs for age(xid) and mxid_age(xid)

Bruce Momjian <bruce@momjian.us>

Commit: 48b5aa31437a161356fb8ec820b81b7b67cf04c2
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-11-24T19:36:00Z
Releases: 17.0
doc:  add docs for age(xid) and mxid_age(xid)

Reported-by: David Rowley

Discussion: https://postgr.es/m/CAKJS1f_OQpz7rpe-KJmskVxbU06buiXbfonxG3JLB+nGCJ5E=g@mail.gmail.com

Backpatch-through: 16

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doc/src/sgml/func.sgml modified +28 −0

Documentation touched