Updated autocomplete tutorial

[JAHammy]

Updated autocomplete tutorial to bypass recent command_type error with automatic conversion of c-style strings to booleans instead of to std::strings, with the hope that this code should now work out of the box for new developers.

The c-style string arguments near the ends of lines 53-56 are now explicitly converted to std::string before being converted implicitly to command_type.

Documentation change checklist

• My documentation changes follow the docs style guide and any code examples follow the coding style guide.
• I tested that my change works before raising the PR (via running doxygen, and testing examples).
• I have not moved any existing pages or changed any existing URLs without strong justification as to why.
• I have not generated content using AI or a desktop utility such as grammarly.

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