I generally don’t include ACF in anything I build, plugins or themes, and instead state that ACF Pro is required. Since I’m usually the one installing these plugins or themes then I just make sure what’s needed is there. But other times, for example my medium editor field plugin, I reduce the functionality of the plugin if the needed field types do not exists, for example in this plugin you can’t add custom buttons if the repeater field is not available. But I also don’t generally sell plugins or themes and only work for clients. If a client leaves I just deactivate the license and updates are up to them from that point on. Overall I’m not a big fan of plugins installed in/by themes or other plugins unless they are installed in a way that they can be updated independently.
As far as adding to the documentation, you’d need to talk to the developer.
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