Merge pull request 0xPolygon#2444 from 0xPolygon/cdk/migration

CDK: Migrate 9-12

Author: EmpieichO

docs/cdk/getting-started/cdk-cli-tool.md

@@ -0,0 +1,3 @@
+!!! tip
+    The migration instructions for moving from fork 9 to fork 12 are coming soon.
+

docs/cdk/how-to/migrate/forkid-9-12.md

@@ -58,7 +58,6 @@ nav:
         - Version compatibility matrix: cdk/releases/version-matrix.md
       - Get started: 
         - Local deployment guide: cdk/getting-started/local-deployment.md
-        - CLI tool: cdk/getting-started/cdk-cli-tool.md
       - Concepts:
         - Layer 2s: cdk/concepts/layer2s.md
         - L2 architecture overview: cdk/concepts/architecture.md
@@ -72,6 +71,7 @@ nav:
         - Admin upgradeability: cdk/concepts/admin-upgradeability.md
       - How to: 
         - Migrate:
+          - Fork id 9 to 12: cdk/how-to/migrate/forkid-9-12.md
           - Fork id 7 to 9: cdk/how-to/migrate/forkid-7-to-9.md
           - General guide for partners: cdk/how-to/migrate/fork.md
         - Create custom native token: cdk/how-to/use-native-token.md