Make Overview less prescriptive

[SimonSapin]

This "must" came across as opinionated on what the reader should do, rather than what composition can empower them to do.

[SimonSapin]

This change is smaller than the diff suggests but prettier doesn’t seem to support something like https://sembr.org/ for prose wrapping.

[benjie]

I approve of the general shape of these changes, but with the can->should change recommended below.

[SimonSapin]

Pushed changes that can be squashed

[SimonSapin]

@benjie At the moment the PR says “2 workflows awaiting approval”, is there something else I need to do?

[benjie]

@michaelstaib Thoughts?

[michaelstaib]

The change is wrong in my mind. The intend is that you can change the general service structure but this must not break the contract with the client.