Complete collaboration policies template with documentation

Co-authored-by: KamilSznajdrowicz <[email protected]>

Author: 2 people

docs/content_management/collaborative_editing/collaborative_editing_guide.md

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+---
+description: Overview of collaboration features in Ibexa DXP
+---
+
+# Collaborative Editing Guide
+
+This is a placeholder for the collaborative editing product guide that demonstrates collaboration features.
+
+## Related Documentation
+
+- [Collaboration Policies](../../permissions/collaboration_policies.md) - Permission policies for collaboration features