Update sql-replication.md

[FranciscoNabas]

The correct column name for the SQL Server maintenance mode query is 'SiteStatus' instead of 'Status' Correct query:
SELECT * FROM ServerData
WHERE SiteStatus = 120

[prmerger-automator]

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

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[FranciscoNabas]

Table information from a Configuration Manager Current Branch database.

[prmerger-automator]

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

[MandiOhlinger]

@FranciscoNabas Hey Francisco - This PR has a merge conflict. If it's still needed, can you create a new pull request? We want to make sure you get credit for the doc change.