Update PriorityCleanup description

[joagarwal]

Submitted via Learn Editor.

[learn-build-service-prod]

Learn Build status updates of commit 214c100:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/New-RetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)

For more details, please refer to the build report.

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[learn-build-service-prod]

Learn Build status updates of commit d10200d:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/New-RetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)

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

[learn-build-service-prod]

Learn Build status updates of commit d95907e:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/New-RetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)

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