Add Rails logging configuration for Ruby APM correlation #3783
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What does this PR do?
Adds another example of configuring Ruby APM with correlation IDs for Rails logging.
Motivation
Make it clearer for our Rails users how to activate this in the simplest possible manner.
Preview link
https://docs-staging.datadoghq.com/delner/apm_ruby_add_rails_log_example/tracing/languages/ruby/
Additional Notes
Describes DataDog/dd-trace-rb#673