Fix redundant/broken intradoc links and minor cleanup #1188

Job	Run time
cargo-deny	45s
format	29s
clippy-check	1m 32s
coverage-main	1m 31s
msrv	2m 43s
check-minimal	56s
coverage-tests	1m 25s
Documentation on Github Pages	56s
coverage-tests (server_system)	1m 22s
coverage-tests (client_system)	1m 42s
coverage-tests (client_system, server_system)	1m 57s
	15m 18s

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