Adding a note about Array objects

[Muizmir]

This edit was suggested by a customer when I found out that facets can't be added to Array objects (after consultation with T2 in Logs OH). The workaround is to extract the attribute in Array object and then remap it. The extracted attribute will have the 'create facet' option.

What does this PR do?

Motivation

Additional Notes

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Reviewer checklist

• [ ] Review the changed files.
• [ ] Review the URLs listed in the Preview section.
• [ ] Check images for PII
• [ ] Review any mentions of "Contact Datadog support" for internal support documentation.

[buraizu]

Thanks, created DOCS-3920 for tracking.

[Muizmir]

Hi @maycmlee , that looks good to me.