Fix typo paylod -> payload

[WillDaSilva]

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[edsiper]

thanks for this contribution.

To get this merged, please make sure the PR is according to the requirements from the contributing guide, specifically:

• https://github.com/fluent/fluent-bit/blob/master/CONTRIBUTING.md#commit-changes

thank you

[WillDaSilva]

@edsiper Those instructions state that my commit cannot edit multiple plugins at the same time, and that each must be prefixed with the plugin being edited. Are you asking that I create multiple PRs to fix this typo? You're feel to do that yourself, but I'm not interested in doing that sort of busy work.