Update commandhandler.cpp

[TylerStocks1]

changed except to accept

I saw "expect" on the documentation online, however I understand its similar but the correct wording I believe should be "Accept"

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.

[CLAassistant]

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[github-actions]

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[Jaskowicz1]

Even if this wasn't closed, this PR wouldn't be accepted as both terms are perfectly okay.