Update instrumentation generator script output

[kaylareopelle]

There's some output in the instrumentation generator script related to the CI that's inaccurate. Update the script to reflect the current files that need to be updated.

See: https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/946/files#r1597226769

Also, update the order of the methods generated in the instrumentation file and include examples related to this section of the instrumentation guide.

https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/946/files#r1597239989

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[kaylareopelle]

@AkhigbeEromo I think this is a good one for you to start with! Let me know if you have any questions!

[AkhigbeEromo]

Thank you @kaylareopelle, I will check it out