Issue #21058: Fix a leak of file descriptor in tempfile.NamedTemporaryFile(),
close the file descriptor if os.fdopen() fails
Issue #21058: NamedTemporaryFile() closes the FD on any error, not only Exception
Closes #18456: Doc fix: PyDict_Update only works with dict-like objects, not key-value sequences. Patch by priyapappachan.
Closes #21045: make the Qt help build not look completely stupid
Updated external link in documentation.