Update variables-transact-sql.md

[athomas-octoberthree]

Corrected example incorrectly showing two batches of statements separated by GO. This change shows code that accurately reflects the point being made in the section.

[prmerger-automator]

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[athomas-octoberthree]

Tried to follow contrib guidelines at https://learn.microsoft.com/en-us/sql/sql-server/sql-server-docs-contribute?view=sql-server-ver17 to best of my ability

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[v-dirichards]

@rwestMSFT

Can you review the proposed changes?

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[Copilot]

Pull request overview

Updates the Variable scope example in the Transact-SQL variables reference to accurately demonstrate that local variables are scoped to a batch and become invalid after a GO batch separator.

Changes:

• Inserted a GO batch separator between the variable assignment and the subsequent SELECT that references the variable.