typo atomic-update.1.md
typo atomic-update.1.md

Signed-off-by: Sally O'Malley <bee3253eddd7c56f05b74af1273e543198dde2a4@redhat.com>

charliedrage/atomic,praiskup/atomic,sallyom/atomic,aveshagarwal/atomic,rh-atomic-bot/atomic,ibotty/atomic,lsm5/atomic,ibotty/atomic,lsm5/atomic,dustymabe/atomic,cdrage/atomic,cdrage/atomic,rh-atomic-bot/atomic,aveshagarwal/atomic,charliedrage/atomic,dustymabe/atomic,sallyom/atomic,praiskup/atomic