Fixed Documentation - review code-block::python which force syntax highlighting

code-block:: python it forces the syntax highlighting even if there are errors so we only need it when the auto-syntax highlighting doesn't work and we can't or don't want to fix the example
I think it's not really useful for incomplete code blocks that are more for example purposes, especially when reading on smaller screens, but you can convince me otherwise. I'd definitely keep it for blocks in the tutorial that meant to be copy/pasted.