bpo-25381: Update explanation of exceptions in C. (GH-26838) (GH-29568)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit ad43dc0b54994e7e7d06e3d4896ade188b36ee12)
2 files changed