strconv: Unquote example looks like a unit test instead of an example

[bradfitz]

The Unquote example (https://golang.org/pkg/strconv/#Unquote) looks like a unit test instead of an example.

That is a sea of backslashes and quotes. I think we could make a more readable example.

[pciet]

I can submit the CL if this is ok: https://play.golang.org/p/1n5phD85F--

[sabin-rapan]

Already had a CL to submit. I published it now here

[gopherbot]

Change https://golang.org/cl/92015 mentions this issue: strconv: Update Unquote example to be more concise