[PATCH] Perl TODO related to threads::shared done

The entry in perltodo.pod for 'Improving "threads::shared"' was done
with the implementation of the shared_clone() function added to
shared.pm.  Attached patch removes that TODO.

(If I misinterpreted what the TODO was supposed to do, let me know.  Thanks.)

• [PATCH] Perl TODO related to threads::shared done by Jerry D. Hedden
• Re: [PATCH] Perl TODO related to threads::shared done by Steve Peters
• Re: [PATCH] perltodo.pod cleanup for nonxs installation by Nicholas Clark