Update sys-query-store-plan-transact-sql.md

[mariyaali]

@WilliamDAssafMSFT

[PRMerger17]

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

[ktoliver]

#label:"aq-pr-triaged"

[WilliamDAssafMSFT]

#hold-off
@mariyaali didn't catch this at first but this wasn't created against the sql-docs-pr repo like your other one from this morning. Need to do the same thing against the right repo. Members of product teams much use the sql-docs-pr repo and the validation and build engine in there. It's not an uncommon mistake. To prevent this, you can install use this browser extension in the Edge browser to redirect Github edit button links to use the -pr repo, so that you won’t accidentally create edits against the sql-docs repo.