Remove reference to `fmt` in docs about gno HOT 2 CLOSED

Irrespective of fmt involvement in tests, it's also referenced in a realm within the how-to guide. We can replace this specific usage with ufmt in the meantime until a more long-term solution is provided that addresses what you've touched on, etc. @thehowl

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imo better to explain it. There is a "test context" and a normal "execution context", and there will likely continue to be.

You can find a list of all of the "extra packages" and their functions here:

The functions, variables and types they expose are below in the switch statement. Note that not all of the package names in the switch cases are available in test contexts; only the ones in the if statement.

These work together with the "testing stdlibs", available here: https://github.com/gnolang/gno/tree/master/gnovm/tests/stdlibs -- currently it only covers a few functions in std.

The long term plan (2-3 months down the line, at least): have fmt use reflection, and not be "special" to test contests, together with other useful "test-specific" packages (crypto/md5 and sha1 maybe, encoding/binary, encoding/json, encoding/xml, math/big, math/rand).

We will continue having test-specific functions in std, and likely introduce debug which is also test-specific; so they have to be documented anyway. I suggest making a list of the functions that are currently exported in tests through gonative, and listing them referencing just the Go documentation directly, saying that most of them will eventually be ported over to Gno and be available for docs with gno doc.

Test specific stdlibs will also be available in gno doc eventually :)

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