Documentation: Fixed broken links

[kickoke]

Summary

The deploy log in Netlify returned the following broken links:

6:34:19 PM: - On source page path = /docs/agent/claim:
6:34:19 PM:    -> linking to /docs/agent/packaging/distributions
6:34:19 PM: 
6:34:19 PM: - On source page path = /docs/agent/packaging/installer/methods/kickstart:
6:34:19 PM:    -> linking to /docs/agent/packaging/installer/methods/packaging/installer/methods/macos
6:34:19 PM: 
6:34:19 PM: - On source page path = /docs/agent/packaging/installer/methods/macos:
6:34:19 PM:    -> linking to /docs/agent/packaging/installer/methods/claim#troubleshooting (resolved as: /docs/agent/packaging/installer/methods/claim)
6:34:19 PM: 
6:34:19 PM: - On source page path = /guides/step-by-step/step-99:
6:34:19 PM:    -> linking to /docs/agent/#contribute (resolved as: /docs/agent/)

This PR tries to fix the broken links.