bpo-41572: Fix grammar in BaseTransport.close docstring (GH-21914) (#21929)

Fix grammar in BaseTransport.close docstring.

https://bugs.python.org/issue41572

Signed-off-by: Cleber Rosa <crosa@redhat.com>
(cherry picked from commit 1afb42cfa82dad0ddd726f59c6c5fcb3962314db)

Co-authored-by: Cleber Rosa <cleber.gnu@gmail.com>
1 file changed