[docs] [issue36896] clarify in types.rst that FunctionTypes & co constructors don't have stable signature

[Matthias Bussonnier]

Matthias Bussonnier <bussonniermatthias at gmail.com> added the comment:

Victor recently implemented CodeType.replace(); which I believe will cover many of the usecase.

Should I also send a PR that update the DocStrings of (some of) ? these objects? many people don't go and read the html docs...

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