proposal: specify renamed imports in examples

[gbbr]

Code example that use named import paths can render the code confusing because it is unclear to the reader which package the import refers to. Regardless of whether these are considered an anti-pattern or not, it's a valid use case and it would be helpful to cover for.

Example documentation with the problem: https://godoc.org/gopkg.in/DataDog/dd-trace-go.v1/contrib/gorilla/mux.

A possible solution would be:

Where this would be shown only for named imports.