fixing minor typo in documentation

[Chambras]

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Description

Fixing minor typo in azurerm_automation_runbook and azurerm_automation_job_schedule documentation.

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• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
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This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #28001

[stephybun]

Thanks @Chambras LGTM 📖

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