docs: Correct LocalShellTool documentation and add external link

[MuhammadHamidRaza]

This pull request aims to correct and clarify the documentation for the LocalShellTool.

There was some initial confusion regarding the tool's classification. While the documentation lists it under "Hosted tools," the tool itself operates on the local machine. After discussion, it's clear that adding extensive details would clutter this page.

This PR provides the definitive solution by:

• Reverting the previous changes that added more text.
• Re-adding the tool's entry to ensure it's accurately listed.
• Updating the documentation to reflect the maintainer's guidance, which is to keep the page concise and link to a separate, detailed guide for more information.

This approach resolves the inconsistency and provides a clean, user-friendly document that is easy to maintain.

[seratch]

Hi, this is not the way I suggested at #1538 (comment) Let me close this one.