[3.9] bpo-17852: Doc: Fix the tutorial about closing files (GH-23135)#23527

miss-islington merged 1 commit intopython:3.9python/cpython:3.9from

miss-islington:backport-c8aaf71-3.9miss-islington/cpython:backport-c8aaf71-3.9Copy head branch name to clipboard