doc/vidjil-format.md: corrections

Thanks to the discussion with Patrice and @espyr.
10 jobs for feature-c/doc-format in 7 minutes and 46 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test Tools
passed #382325
test_tools

00:00:06

 
  Test Quality
passed #382326
web
code_quality

00:00:09

 
  Test Unit
passed #382327
web
test_browser_unit

00:00:47

 
  Deploy Review
passed #382328
web
deploy_review

00:00:16

manual #382329
web allowed to fail manual
stop_deploy_review
 
  Test Functional
passed #382330
web
test_browser-functional

00:04:06

 
  Test Functional External
failed #382353
web
test_browser-functional-external

00:02:19

failed #382344
web
test_browser-functional-external

00:02:17

failed #382341
web
test_browser-functional-external

00:02:18

failed #382331
web
test_browser-functional-external

00:02:20

 
Name Stage Failure
failed
test_browser-functional-external Test Functional External
3 runs, 4 assertions, 0 failures, 1 errors, 0 skips

[Minitest::CI] Generating test report in JUnit XML format...
=== functional/external_test_segmenter.rb : FAILED

Makefile:16: recipe for target 'external' failed
make: *** [external] Error 1
make: Leaving directory '/home/gitlab-runner/builds/9103f1f5/0/vidjil/vidjil/browser/test'
ERROR: Job failed: exit status 1