(DOCS-14726) Update exact_match true description

[jeff-morgan-dd]

What does this PR do?

Corrects exact_match description for behavior when set to true.

Motivation

Fixes DOCS-14726 created as a result of a Slack conversation re: customer confusion.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add qa/required if this PR needs QA validation, or qa/skip-qa if it does not. Exactly one of the two is required.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[datadog-prod-us1-6]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

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[dd-octo-sts]

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