[issue5323] document expected/required behavior of 3.x io subsystem with respect to buffering

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Yes, this behavior is documented.

There is one test that mixes iteration and readline, in 
test.test_io.TextIOWrapperTest.testSeeking, but it shows a difference 
between the two methods: to be faster, __next__ disables the tell() 
function.

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nosy: +amaury.forgeotdarc

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