doc: update PyZMQ installation instructions, ZeroMQ link
doc: update PyZMQ installation instructions, ZeroMQ link

Summary: This is a backport of [[https://github.com/bitcoin/bitcoin/pull/19870 | core#19870]]

Test Plan: Tested link and `pyzmq` installation instruction

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10232

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