[3.11] gh-95691: Doc BufferedWriter and BufferedReader (GH-95703) (#97947)

gh-95691: Doc BufferedWriter and BufferedReader (GH-95703)
(cherry picked from commit 0d68879104dfb392d31e52e25dcb0661801a0249)

Co-authored-by: 180909 <734461790@qq.com>

Co-authored-by: 180909 <734461790@qq.com>
1 file changed