Fix typo in functions-worker.md (#5838)
Fix typo in functions-worker.md (#5838)

from `Functions-work` to `Functions-worker`.
yahoo/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,massakam/pulsar