APIM / Redis cache setup - Update default connection string format in documentation

[nrobert]

Fix missing "password=" block in the default connection string

[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit 3129360:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/api-management/api-management-howto-cache-external.md	✅Succeeded

For more details, please refer to the build report.

[Copilot]

Pull Request Overview

This PR corrects the documentation for the Redis cache connection string format used with Azure API Management by adding the missing password= parameter prefix.

Key Change:

• Updates the connection string example to include the password= prefix before the cache access key placeholder

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[v-dirichards]

@dlepow

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

[dlepow]

Thanks for the fix @nrobert! LGTM

[dlepow]

#sign-off