Update Databricks Section of grants.md

Add bullet point for Databricks specific grants that aren't supported by dbt grants

website/docs/reference/resource-configs/grants.md

@@ -243,6 +243,7 @@ models:
 - Databricks automatically enables `grants` on SQL endpoints. For interactive clusters, admins should enable grant functionality using these two setup steps in the Databricks documentation:
   - [Enable table access control for your workspace](https://docs.databricks.com/administration-guide/access-control/table-acl.html)
   - [Enable table access control for a cluster](https://docs.databricks.com/security/access-control/table-acls/table-acl.html)
+- In order to grant `READ_METADATA` or `USAGE`, use [post-hooks](https://docs.getdbt.com/reference/resource-configs/pre-hook-post-hook)
 
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