Show INNER as optional ([ INNER ] JOIN)

[AliRezaBoroujerdian]

This PR updates the join syntax list to use [ INNER ] JOIN instead of INNER JOIN.

Rationale: In T-SQL, JOIN defaults to INNER

[prmerger-automator]

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[learn-build-service-prod]

Learn Build status updates of commit 94f9f2f:

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docs/relational-databases/performance/joins.md	✅Succeeded

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[Copilot]

Pull Request Overview

This PR updates the documentation to clarify that the INNER keyword is optional in T-SQL JOIN syntax by changing the syntax notation from INNER JOIN to [ INNER ] JOIN.

• Updated join syntax documentation to show INNER as an optional keyword
• Aligns with T-SQL's default behavior where JOIN without a qualifier defaults to INNER JOIN

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[ttorble]

@MikeRayMSFT

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

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

[prmerger-automator]

PR 10186 has been merged from AliRezaBoroujerdian:docs/join-syntax-inner-optional to MicrosoftDocs:live by rwestMSFT.

@AliRezaBoroujerdian

[rwestMSFT]

Thanks for your contribution!