doc: update metacpan.org links to avoid redirects

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: 5f80cd287c29b88fd364634b16c6c155d5617e8c
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2022-11-16T09:24:37Z
Releases: 16.0
doc: update metacpan.org links to avoid redirects

The /release/ links are redirected to /dist/ and /pod/release/ to
/release/../view/, so update our links accordingly to avoid 301
redirects.

Discussion: https://postgr.es/m/CA672723-BAD2-436E-B6E6-163841E11A1B@yesql.se

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