Resolved a typo in validators

[berdav]

Description

Resolved a typo in validators.

Acceptance tests

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Release Note

Release note for CHANGELOG:

Resolved a typo in validators.

References

Community Note

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[hashicorp-cla-app[bot]]

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[berdav]

As I need to provide a comment from the guidelines, the title says all. There was a typo in the validators for cron syntaxes.