fix: add missing package name in install instructions in CLI

[foyarash]

Title

Add missing package name in instructions for Page Router in CLI

Type of Change

• [ ] New feature
• [x] Bug fix
• [ ] Documentation update
• [ ] Example update
• [ ] Refactoring
• [ ] Hotfix
• [ ] Security patch
• [ ] UI/UX improvement

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 6fa3e027eb71110bb52535f2b3b3949e5e14835b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------------------- | ----- | | @premieroctet/next-admin-cli | Patch |

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