Fix FDoc html generation for code examples.
Fix FDoc html generation for code examples.

There was a bug with using the @ prefix notation for highlighting words as code within <pre> / <code> blocks themselves (indented & turned into HTML via Markdown).
It caused problems when using instance variables (etc.) within example code blocks.
To fix this we run the docstring through markdown first and translate the @ prefix notation afterwards outside of <pre> blocks.
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