Update stale public docs

[kford-newrelic]

Description

Timeboxed team activity to update possibly stale public documentation.

Acceptance Criteria

Select public docs are reviewed as a team and updated if appropriate.

Design Consideration/Limitations

N/A

Dependencies

N/A

Additional context

Tracking spreadsheet for the docs to be reviewed. Update as appropriate when doc updates are made.

[workato-integration]

https://issues.newrelic.com/browse/NR-163899

[workato-integration]

https://new-relic.atlassian.net/browse/NR-163899

[kaylareopelle]

In addition to the docs in the newrelic/docs-website repo, we should also review the documentation in our repo, such as our README, CONTRIBUTING.md, etc.

[kaylareopelle]

PR newrelic/docs-website#15599 fixes many of the outdated documents in the tracking spreadsheet.

Some notable remaining documents are:

• Ruby agent requirements and supported frameworks
• Record deployments (see Retire deprecated way of creating deployment markers #2373)
• Ruby custom instrumentation
• Install the Ruby agent, specifically enhanced instructions on installing with Docker

We also still need to analyze documents in the "Instrumented Gems" and "Troubleshooting" groups to identify outdated content.

Documentation in our repo has also not been audited/updated.

[kaylareopelle]

Other related PRs:

• Update DOCKER.md #2375
• Update config doc opening #2376