Yes indeed they do not read it at all. Even if you tell them right before the to be copied text to replace the obvious placeholders with the real value needed. And then they complain on slack that 'this thing in the docs doesn't work. Help!'.

Always have them show you exactly what they did. No descriptions of what they did, let them show you. Yes, do ask the obvious 'did you replace the placeholders?' question.

Very common answer: 'What placeholders?'