Pre-check

• I know I can edit the docs but prefer to file this issue

Describe the improvement

Missing documentation

Description of the improvement / report

I cannot find anywhere how to get webdriverIO v8+ to work with Chromium (NOT Chrome) browser. I am using Ubuntu 20 on aarch64 platform and Chrome does not exist for this platform, so I need to use Chromium. Pointing to chromium driver does not work, I get error about sessionID not created b/c Chrome is not running. Not pointing to chromium driver causes error connection refused. Please help by documenting how to get webdriverIO to work with Chromium.

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