Update ECS mapping network events doc to correct DNS request/response terminology

[alexandra5000]

1. What does this PR do?

Fixes mislabeled rows in the DNS events example table on the ECS documentation page.

Specifically, this PR corrects the “event” labels for rows 3 and 4 in the DNS events table so they accurately reflect DNS query and response directionality based on source and destination IPs.

Closes #2844

2. Which ECS fields are affected/introduced?

None.

3. Why is this change necessary?

The DNS events table currently labels two example rows incorrectly:

• A DNS query request is labeled as an “answer request”
• A DNS answer response is also labeled as an “answer request”

4. Have you added/updated documentation?

YES

5. Have you built ECS and committed any newly generated files?

N/A

6. Have you run the ECS validation tests locally?

N/A

7. Anything else for the reviewers?

This is a documentation-only fix.

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

Commit Message

Fix mislabeled DNS event examples in ECS network mapping docs

[github-actions]

Documentation changes preview: https://docs-v3-preview.elastic.dev/elastic/ecs/pull/2582/reference/

[github-actions]

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🔍 Preview links for changed docs

• docs/reference/ecs-mapping-network-events.md