doc: clarify add/removeListener semantics
Clarify that adding or removing a listener is not idempotent. PR-URL: https://github.com/joyent/node/pull/8911 Signed-off-by:Timothy J Fontaine <tjfontaine@gmail.com> Cherry-picked-from: https://github.com/joyent/node/commit/48536394c954b2e3e41dcaee3778373ea79e2c25
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