add documentation for otel env mappings

[khanayan123]

What does this PR do? What is the motivation?

Merge instructions

• [ ] Please merge after reviewing
• [x] add additional documentation for Java OTEL env var mappings before merging

Additional notes

[github-actions[bot]]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/opentelemetry/interoperability/environment_variable_support

Modified Files

• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/opentelemetry/interoperability/
• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/tracing/trace_collection/library_config/dotnet-core
• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/tracing/trace_collection/library_config/dotnet-framework
• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/tracing/trace_collection/library_config/go
• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/tracing/trace_collection/library_config/java
• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/tracing/trace_collection/library_config/nodejs
• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/tracing/trace_collection/library_config/php
• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/tracing/trace_collection/library_config/python
• https://docs-staging.datadoghq.com/ayan.khan/add-docs-for-otel-env-var-support/tracing/trace_collection/library_config/ruby

[domalessi]

Created a JIRA ticket for the editorial review from the Docs team: https://datadoghq.atlassian.net/browse/DOCS-8391

[khanayan123]

Looks good! I'm suggesting just a few minor style tweaks, but approving. Let me know when this is out of draft and ready to merge! 🚀

Ready to merge

[brett0000FF]

@khanayan123 - I pushed a commit to resolve a merge conflict due to another doc I merged earlier. 👍 Let me know if this is good to merge, and I'll merge it! 🚀