Mention about use of `|` or `&&` in one's commands

[akauppi]

I think the root documentation should have a little bit more about what's allowed and what not in the command. I find it handy to place even complicated commands, within the YAML file (instead of spreading them into external .sh files), just like we sometimes do in npm package.json.

Anyhow, the fact that | or && quietly chops my command was surprising.

The content of the PR is just a suggestion.

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[usha-mandya]

Thanks for the PR. Closing this based on Sebastiaan's comment above. Feel free to continue the conversation after I close.