doc: fix wrong variable name in example of `timers.tick()`
Change variable name from twoSeconds
to threeSeconds
because actual value is 3000(ms). And add missing supported timer value(clearImmediate). Plus, fix typo(implicity -> implicitly).
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Change variable name from twoSeconds
to threeSeconds
because actual value is 3000(ms). And add missing supported timer value(clearImmediate). Plus, fix typo(implicity -> implicitly).