docs: update documentation path in comments and tests

[mjansrud]

🎯 What

Provide a concise description of the changes:

• ❓ What changes have you made? (High-level overview)
• 🎉 What does it mean to the user? (In plain English)

Example:

• 🚀 Added new MCP tool get_terragrunt_config.
• 🎉 This allows clients to request specific Terragrunt configuration details
  via the MCP server.

🤔 Why

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• 💡 Why were these changes made?
• 🎯 What's the benefit?

Example:

• 💡 This tool was added to provide necessary context for an AI agent analyzing
  Terragrunt setups.
• 🎯 This enables more accurate and context-aware interactions related to
  Terragrunt documentation and state.

📚 References

Link any supporting context or documentation:

• 🔗 Github issues, documentation, helpful links.
• ✅ Use closes #123, if this PR closes a GitHub issue #123