Update 3-auto-discovery.md

[adamjsr]

Fix incorrect reference to environment, improve readability.

Summary

Fix incorrect reference to environment, improve readability.

Fixes # (optional — link an issue / ticket)

Type of change

• New workshop
• New chapter or page in an existing workshop
• [X ] Content edits (clarity, correctness, polish) to existing pages
• Restructure / reorganize (move, split, merge, renumber)
• URL change — aliases: added for any renamed or moved page
• Image / screenshot refresh
• Translation sync (content/en ↔ content/ja)
• Content removal / archival
• Theme bump or shortcode / layout adoption
• Frontmatter-only changes (weight, draft, hidden, archetype, …)
• Lint / formatting cleanup (low-risk, scan-approve)
• CI / build / tooling
• Bug fix (broken link, busted shortcode, etc.)
• Other — describe:

What's affected

• Workshop(s) / area: ninja-workshops/foundations/1-automatic-discovery/1-petclinic-monolith
• Languages: [ X] content/en    [ ] content/ja

Reviewer focus

N/A

Screenshots / preview

N/A

Verification

• hugo builds cleanly (no warnings or errors)
• npx markdownlint-cli2 '<paths/*.md>' passes for touched files
• Any new images have meaningful alt text
• No TODO image placeholders left unintentionally
• No published URLs changed, OR aliases: frontmatter added for any renamed / moved pages
• Identified and updated parallel / sibling pages where this workshop shares content with another (e.g. observability-cloud-short ↔ observability-cloud), OR confirmed none exist

[rcastley]

You explicitly call out Spring PetClinic in this PR but in other PRs you have not.

When you start the Spring PetClinic application, you will see the collector automatically detect the application and instrument it for traces and profiling.

Please just leave it as PetClinic application as we introduce it as a Springboot app in the workshop intro.