Update wp-security-cds.md

[tsalopek]

Adding missing "is" in "Sharing tougher to troubleshoot..."

[learn-build-service-prod]

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[sericks007]

@tsalopek, thanks!

[learn-build-service-prod]

Learn Build status updates of commit bdcf3ef:

✅ Validation status: passed

File	Status	Preview URL	Details
power-platform/admin/wp-security-cds.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