Suggestion: Easier orientation for newbies

Hello, I came here via the boost mailing list, out of curiosity about the upcoming boost release.

Even though I work on mostly C++20 code bases (how good is that!) I didn't happen to be familar with [C++ 17 charconv](https://en.cppreference.com/w/cpp/header/charconv) and it look me to little while to figure out the scope and possible use of boost::charconv. Years ago I got interested in a C++ alternative to iostreams and printf, so there are details here that in indeed familiar, so that helped the penny drop. Definitely the unit tests shed a lot more light for me.

Performance is a recurring issue in the work I do. If boost::charconv (or indeed C++17 charconv) can help me read and write huge CSV files faster, that would be interesting indeed. Generally I use [fmt::format](https://fmt.dev/11.0/) as my goto, certainly some performance characterisation would be of interest.

I do appreciate that as developers we tend to focus on the implementation details, and perhaps less on the marketing.

Anyway, best wishes with charconv in boost 1.86.0!