bpo-32674: Improve the docstring for __import__ (GH-5339) (GH-5488)

Clarify that the level argument is used to determine whether to
perform absolute or relative imports: 0 is absolute, while a positive number
is the number of parent directories to search relative to the current module.
(cherry picked from commit 461d225b195eec5269f317323b41115516144c41)

Co-authored-by: oldk <oldk1331@users.noreply.github.com>
1 file changed