Fixes for the example plugin Job in README

[finnito]

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PR Summary

e.g. Doc fixes for bot cron jobs

Related Issues

Fixes bot start errors because of missing module
Fixes error adding the job

Tests

Implemented the fixes in a plugin for my own bot and it worked.

[CLAassistant]

All committers have signed the CLA.

[Roach]

@finnito thanks for the patch! Would you mind signing the CLA linked above so we can get this merged?

[finnito]

@Roach Done!