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

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:


New changeset 13136e83a637a9f1cfbada7e93097005296659b4 by Petr Viktorin (Matthias Bussonnier) in branch 'master':
bpo-36896: Clarify that some types constructors are unstable (GH-13271)
https://github.com/python/cpython/commit/13136e83a637a9f1cfbada7e93097005296659b4


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<https://bugs.python.org/issue36896>
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