Adding ANSI_WARNINGS explainer, re: COUNT is int NULL

[daiplusplus]

See https://github.com/MicrosoftDocs/sql-docs/issues/7088

[prmerger-automator]

@Jehoel : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[opbld33]

Docs Build status updates of commit 50e4d20:

✅ Validation status: passed

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docs/t-sql/functions/count-transact-sql.md	✅Succeeded

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[prmerger-automator]

@Jehoel : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[opbld30]

Docs Build status updates of commit 73ccfd7:

✅ Validation status: passed

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docs/t-sql/functions/count-transact-sql.md	✅Succeeded

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[Court72]

@markingmyname

Can you review the proposed changes? IMPORTANT: When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[opbld32]

Learn Build status updates of commit a0cd29b:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/t-sql/functions/count-transact-sql.md	✅Succeeded

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Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[opbld33]

Learn Build status updates of commit 51e3c43:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/t-sql/functions/count-transact-sql.md	✅Succeeded

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[rwestMSFT]

Replaced by internal PR. This PR will close automatically.