Update chrony-receiver.rst

[cesarfr1]

fixing typo on the pipeline's receiver name

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Describe the change

Enter a description of the changes, why they're good for the Observability Cloud documentation, and so on.
Just fixing a typo that creates a mismatch between the receiver name and the pipeline's receiver name
If this contribution is time sensitive, tell us when you'd like this PR to be merged.

[aurbiztondo-splunk]

Thanks for the update, @cesarfr1!