Update service provider details section of in displayr-tutorial.md

[Benjamin-Displayr]

The ACS URL can vary depending on the region of the user so updating to clarify where the user can find the information to fill in this section.

[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit c40c904:

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[learn-build-service-prod]

Learn Build status updates of commit 0cd7cd2:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/identity/saas-apps/displayr-tutorial.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[v-dirichards]

@jeevansd

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