WIP better error msg

[dadhi]

TL;DR;

The PR adds the usage examples into the error message for TOO FEW ARGS and adjusts the tests.

Explanation

The PR is improving the error message for the too few arguments to a function by adding the examples into the message, specifically in the piping context.

I am learning the Roc language and trying to find analogs from my background (C# and a bit of F#, Java, Scala). Trying the pipe operator to replicate C# LINQ (collection processing), I was confused by the error message:

Roc does not allow functions to be partially applied. Use a closure to
make partial application explicit.

I know what the closure is generally, but what does it mean to make partial application explicit. There are too many arbitrary words glued together with the meaning lost on me, sorry :) And what should I do practically to move on?

So the examples may help me to unblock and illustrate explicit closures/lambdas and partial application. Like this:

    Roc does not allow functions to be partially applied. Use a closure to
    make partial application explicit.

    For example: ["a", "b"] |> \list -> Str.joinWith list ", "

    or simplier: ["a", "b"] |> Str.joinWith ", "

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[JRI98]

This PR has no changes. Maybe close?