Update reference to following LHCb!2962

See LHCb!2962 (merged), which removes the LoKi welcome message.

added cleanup label

mentioned in merge request LHCb!2962 (merged)

• [2021-03-09 08:21] Validation started with lhcb-master-mr#2015
• [2021-03-10 00:25] Validation started with lhcb-head#2888

added 1 commit

• 766b313a - Remove LoKi welcome message from reference.

Compare with previous version

added lhcb-head label

removed lhcb-head label

approved this merge request

unassigned @cgobelbu

merged

mentioned in commit 22c0a647