🖋️ Scribe: [update troubleshooting docs]

[fderuiter]

💡 What: Updated the expected error message in the Troubleshooting section of README.md and docs/configuration.rst.
🎯 Why: The documentation showed an outdated error message (Missing required environment variable(s): IMEDNET_API_KEY, IMEDNET_SECURITY_KEY) that didn't match the actual CLI output (IMEDNET_API_KEY and IMEDNET_SECURITY_KEY environment variables must be set.), causing confusion for users.
🧠 Cognitive Impact: Fixes first-run confusion when following the documentation and hitting authentication errors, by ensuring the expected error matches exactly what the user sees in their terminal.
📖 Preview:

**Missing required environment variable(s)**
If you see an error like `IMEDNET_API_KEY and IMEDNET_SECURITY_KEY environment variables must be set.` or an "Unauthorized" API error, ensure you have set these variables in your shell or in a `.env` file in the directory where you run the script. See [Configuration](#configuration).

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PR created automatically by Jules for task 8844006284651431563 started by @fderuiter

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