hyperlink help-files in error messages

[simonpcouch]

Many error messages in infer point to ?some_function and rely on the user to paste that text into the console and run it to see the help-file. The new IDE + cli tooling could make those help-files more accessible, especially when the more relevant help-file is for a method rather than a generic.

i.e.

see ?fit.infer

to

see the {.help [fit() documentation](infer::fit.infer)}

[github-actions]

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