Update sql-database-long-term-backup-retention-configure.md

[FonsecaSergio]

Fix parameter from LocationName to Location
https://docs.microsoft.com/en-us/powershell/module/azurerm.sql/get-azurermsqldatabaselongtermretentionbackup?view=azurermps-6.8.1

[PRMerger15]

@FonsecaSergio : Thanks for your contribution! The author, @anosov1960, has been notified to review your proposed change.

[JennieHubbard]

@FonsecaSergio Thank you for your help on this!

#sign-off

[PRMerger8]

@JennieHubbard: I'm sorry - only the author of this article, @anosov1960, can sign off on your changes. But we do have an exception process - if you are on the Microsoft content or product team for this product area, you can ask the PR review team to review and merge it by sending mail to the techdocprs alias.