docs: pipeline: inputs: tcp: udp: forward: document workers option

[eschabell]

Document the workers option (default 1) that sets the number of listener workers for the TCP, UDP, and Forward inputs. Note that Forward doesn't support workers > 1 together with unix_path.

Note this is from a code merge that did not submit a doc PR.

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[eschabell]

@patrick-stephens ready for review!