[OAS] Fix path to observability rule definitions

[lcawl]

Summary

Relates to #177466, #177443, #177433, ...

This PR fixes the relative paths to the Observability rule definitions that are used in the openAPI specifications.

[ghost]

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• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• /oblt-deploy-serverless : Deploy a serverless Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

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Pinging @elastic/obs-ux-management-team (Team:obs-ux-management)

[kibana-ci]

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• Commit: 93b6464

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