Update Responsible AI review document with new validation section

Added a new section on Responsible AI validation for Microsoft 365 Copilot extensibility.

Author: pablorodMS

learn-pr/wwl/design-responsible-ai-security-governance-risk-management-compliance/includes/6-review-solution-adherence-responsible-ai-principles.md

@@ -108,7 +108,7 @@ The following review model ensures consistency and objectivity when assessing an
 
 - Practices for documenting model lineage, data provenance, and decisions
 
-- Governance processes for review, approval, and sign-off
+- Governance processes for review, approval, and sign off
 
 ### Operational oversight and governance
 
@@ -136,4 +136,4 @@ Responsible AI is not a one-time review—it requires continuous monitoring.
 
 - [Microsoft AI tools and practices](https://www.microsoft.com/ai/tools-practices)
 
-- [Responsible AI validation for Microsoft 365 Copilot extensibility](/microsoft-365-copilot/extensibility/rai-validation)
+- [Responsible AI validation for Microsoft 365 Copilot extensibility](/microsoft-365-copilot/extensibility/rai-validation)