Readme F1 tables don't match results sheets

[lizgzil]

Make sure the results are correctly copied for 2020.3.6_splitting, 2020.3.8_parsing and 2020.4.5_multitask from
https://docs.google.com/spreadsheets/d/1gu6jJ83Ad15VztmB2aCGTgVsQgaudr6rwbU6RO0YV-I/edit#gid=1445206406