Updated Monitoring with screenshots, r34 examples, ref links, yaml.

[y82]

Proposed changes

This PR

• updates the screenshots to match NGINX Plus R34
• fixes links for existing screenshots
• adds up-to-date nginx_api.yaml
• changes the release notes urls to ref

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[mjang]

Approving with a comment

• Do we really need to include versions < r31 in the Enabling the Swagger UI table?