packetbeat: fix possessive 'its' and spelling typos in config and fields

[strawgate]

Summary

Fix two typos in packetbeat configuration and field descriptions.

• packetbeat/_meta/config/beat.reference.yml.tmpl: it's value → its value (possessive, not contraction)
• packetbeat/protos/dhcpv4/_meta/fields.yml: currnet network → current network
• Corresponding generated files updated (packetbeat.reference.yml, x-pack/packetbeat/packetbeat.reference.yml, rendered docs)

Closes #49600

Test plan

• Verify corrected text in template and generated reference configs
• Verify corrected field description in dhcpv4 fields

[github-actions]

🤖 GitHub comments

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• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 884e58d and c3c7cfc.

📒 Files selected for processing (8)

• changelog/fragments/1742774400-fix-typos-packetbeat.yaml
• docs/reference/packetbeat/exported-fields-dhcpv4.md
• docs/reference/packetbeat/packetbeat-reference-yml.md
• packetbeat/_meta/config/beat.reference.yml.tmpl
• packetbeat/packetbeat.reference.yml
• packetbeat/protos/dhcpv4/_meta/fields.yml
• packetbeat/protos/dhcpv4/fields.go
• x-pack/packetbeat/packetbeat.reference.yml

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📝 Walkthrough

Walkthrough

This pull request fixes typos and grammar errors in Packetbeat documentation, configuration files, and field descriptions. The changes correct "currnet" to "current" in DHCPv4 field documentation and "it's" to "its" (possessive form) across multiple reference configuration files and user-facing documentation. A changelog fragment documents the bug fixes, and the corresponding generated asset file is updated accordingly.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	PR addresses the Packetbeat-specific typo fixes from issue #49600: corrects 'it's'→'its' in redact_headers comments across templates, generated configs, and docs; fixes 'currnet'→'current' in dhcpv4 field descriptions.
Out of Scope Changes check	✅ Passed	All changes are within scope. The PR focuses exclusively on Packetbeat typo corrections specified in #49600, excluding the unrelated Kubernetes/autodiscover 'Wether'→'Whether' fixes.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

• 🛠️ Update Documentation: Commit on current branch
• 🛠️ Update Documentation: Create PR

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[elasticmachine]

Pinging @elastic/sec-linux-platform (Team:Security-Linux Platform)

[vishaangelova]

Actually, this needs to be backported to 9.3 for the changes to be published to the docs site (we publish from the latest minor branch).

[vishaangelova]

LGTM!