DOC-436 (hotfix): Fix six copy errors in App Inspection & Tracing quickstart

[quetzalliwrites]

Summary

Fixes the six copy errors reported in the ticket, all in application-inspection-tracing.mdx:

1. Prerequisites — "run run the cleanup step" → "run the cleanup step"
2. Step 3 intro — "resource browse" → "resource browser"
3. Step 3, Lambda item 2 — dropped the stray "and" before "click the messages-api function"
4. Step 3, DynamoDB item 1 — "and click on DynamoDB and then, fromthe Tables tab" → ", click on DynamoDB and then, from the Tables tab" (comma fix + missing space)
5. Step 4 note — "applicatin" → "application"
6. Step 5 expected result — "App Inpsector" → "App Inspector"

Reported by Christian Capdeville.

Linear ticket

https://linear.app/localstack/issue/DOC-436/docs-bug-report-copy-errors-in-the-app-inspection-and-tracing

Test plan

• npx astro build completes successfully (417 pages built)
• Link validator confirms all internal links are valid
• Grepped the file afterward to confirm none of the six typo strings remain

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