docs(synapse-sql): note 14-character minimum password length for SQL authentication

[fr3dgu1s]

Adds an IMPORTANT callout immediately before the Administrative accounts section clarifying that SQL authentication requires a minimum password length of 14 characters, applying to both server admin logins and any SQL-authenticated logins or contained database users.

File: articles/synapse-analytics/sql/sql-authentication.md

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[Copilot]

Pull request overview

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Adds a documentation callout to clarify the minimum password length requirement for SQL authentication in Azure Synapse SQL, ensuring readers understand the constraint before creating administrative or other SQL-authenticated users.

Changes:

• Adds an IMPORTANT note stating SQL authentication requires a 14-character minimum password length.
• Clarifies the requirement applies to server admin logins and SQL-authenticated logins/contained database users.

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[v-dirichards]

Hi @fr3dgu1s - This pull request was opened in the public repo. Microsoft authors and contributors need to make content contributions through the private repository so the content can be staged and validated by the current validation rules, per the Microsoft Docs contributor guide. We can keep this PR open for review and merge, but would you make future content updates in the private repo? Thank you!

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@vvasic-msft

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