Update policy_usage.md

docs/knowledge_base/policy_usage.md

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 # Policy Usage
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 The Phylum policy framework allows you to overlay your threat model and block packages by surfacing issues for packages that violate the defined policy.
 
 ## Group Policy
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 Policies applied at the group level will be inherited by all projects belonging to the group. Only a group administrator can add, remove, enable, and disable group policies.
 
 Group administrators may activate/deactivate group policies by selecting the `Policy` tab in the Group detail view. Use the toggles to activate or deactivate a policy from applying to all of the projects in that group.
 
 ![Group policy tab](../../assets/group_policy_tab.png)
 
 ## Project Policy
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 Project policies can be applied to individual projects (in addition to any inherited group policies). This allows you to further customize the resultant policy for a specific project.
 
 > ⚠️ **INFO** ⚠️