On line 3987 of bash.1 (here: https://git.savannah.gnu.org/cgit/bash.git/tree/doc/bash.1#n3987), `The\fBextglob\fP` is missing a space between 'The' and 'extglob'.
I'm not sure how small typos have to be before they're not worth an email, so if this is, let me know. - John Devin
