Expand DI docs

[p-datadog]

What does this PR do?

Motivation:

Change log entry

Additional Notes:

How to test the change?

[github-actions]

👋 Hey @p-datadog, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

None.

(possible answers No/Nope/None)

^{Visited at: 2025-11-07 11:03:32 UTC}

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 100.00%
• Total Coverage: 98.57% (+0.02%)

View detailed report

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 2a48dbb | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-11-07 11:33:39

Comparing candidate commit 2a48dbb in PR branch di-docs with baseline commit 20f7cba in branch master.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 43 metrics, 2 unstable metrics.

scenario:profiling - stack collector (ruby frames - native filenames enabled)

• 🟩 throughput [+161.065op/s; +163.108op/s] or [+5.123%; +5.188%]