[docs] [issue10403] Use "member" consistently

Éric Araujo <merwok@netwok.org> added the comment:

I used "methods and attribute" in io.rst because BufferedIOBase included one attribute and several methods. My terminology may be off, but I felt this was the correct replacement of "members."

Nearly :) See in the first message:

"Members and methods" should just be "attributes".

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