remove escape character in shell samples

[thisonedev]

fixes #244

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[StephenFluin]

I don't think this is right. For any [block:] style JSON, the escape characters need to stay. It's only when we move to backtick notation (which we should do for all of these examples) that you need to remove the escape characters.

For example, on enabling-https, the echo command looks right in the docs today. Feels like a lucky bug that removing the escape chars still works in those JSON examples.

[thisonedev]

Closing PR. Replaced with #258