Docs: Remove LS tool from official documentation

Title: Docs: Remove LS tool from official documentation

Body:

The LS tool is currently listed as an available tool in the official documentation, specifically in the "Tools available to Claude" table within the settings page (en/docs/claude-code/settings).

However, the LS tool has been removed from the agent's available tools and is no longer used. This makes the documentation inaccurate and can cause confusion for users trying to understand Claude Code's capabilities.

To ensure the documentation accurately reflects the current state of the toolset, please remove the row for the LS tool from the "Tools available to Claude" table.