Update protocol-metrics-packetbeat.asciidoc

[kunisen]

Proposed commit message

Use /inputs/ instead of /inputs. See #36971 (comment) for more details.

Checklist

• [] My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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[botelastic]

This pull request doesn't have a Team:<team> label.

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @kunisen? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[kunisen]

If would be great if we can have someone help us backport this to early versions.... thanks!

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[elasticmachine]

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[elasticmachine]

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cc @kunisen

[elasticmachine]

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• Start Time: 2024-02-22T06:30:57.806+0000

• Duration: 9 min 40 sec

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[elasticmachine]

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• Commit: 4fefbbb

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[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 4fefbbb

cc @kunisen

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 4fefbbb

cc @kunisen