Fix redundant/broken intradoc links and minor cleanup #1185

Job	Run time
clippy-check	1m 12s
cargo-deny	39s
format	21s
Documentation on Github Pages	33s
coverage-tests	1m 56s
coverage-main	1m 17s
check-minimal	42s
coverage-tests (server_system)	1m 34s
msrv	2m 53s
coverage-tests (client_system)	1m 24s
coverage-tests (client_system, server_system)	1m 32s
	14m 3s

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