Docs suggest that [skip ci] and [ci skip] will start a build and then exit

[kevin-suhajda]

When using [skip ci] and [ci skip] in Git commit message, a build will not be started.

The docs currently say the following which is incorrect:

The workflow will still be started but it will exit without building.

https://docs.codemagic.io/yaml-running-builds/starting-builds-automatically/

Builds will be started and exited ('skipped') if when conditions are used.