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fix: doc: Add forgotten image from consensus health

It was referenced by 6e6a8f3b. Since that
image was wrong, created a new screenshot from the current "past 90
days" at consensus-health.tpo.
7 jobs for maint-1.1_consensushealth_img in 50 minutes and 49 seconds (queued for 7 minutes and 40 seconds)
latest
Status Job ID Name Coverage
  Test
passed #7980
python36tor035

00:11:15

passed #7981
python36tor041

00:11:05

passed #7982
python36tor042

00:13:35

passed #7983
python36torstable

00:11:10

passed #7984
python37

00:17:11

passed #7985
python38

00:13:18

passed #7986
python39

00:14:08