share/misc/committers-doc.dot: dru: 2020, not 202

Dru Lavigne's doc commit bit was taken in 2020-05-05

https://cgit.freebsd.org/doc/commit/access?h=refs/internal/admin&id=fb28136a81580786a66ab2494da40b01f4b7a75b

Fixes: 52f576459855 committers-doc.dot: bring file up to date