docs: changed the notes on read_file.

[Jaskowicz1]

This PR alters the notes on dpp::utility::read_file. After experimenting in DPP-UE, I realised that there was no note as to what happens if the file is big and causes the event to timeout, causing a crash in DPP-UE and an error log in DPP. I made the note to give more information to users about this, making sure they know to use thinking if the file is big.

The PR also renames the previous note to be a warning. I feel that the warning is very much required so people know that the function can, and will, block the thread, if the file is big.

Documentation change checklist

• My documentation changes follow the same style as the rest of the documentation and any 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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[Henonicks]

You should also add the note to docs themselves. You are adding documentation anyways.

[Jaskowicz1]

You should also add the note to docs themselves. You are adding documentation anyways.

? This is the docs themselves?

[Henonicks]

? This is the docs themselves?

You've only edited the .h file but the dpp.dev docs will stay the same so the code documentation won't match.

[Jaskowicz1]

? This is the docs themselves?

You've only edited the .h file but the dpp.dev docs will stay the same so the code documentation won't match.

Not true, the docs are auto generated from the .h.

[Henonicks]

Mbad, didn't know that