Use a better error when using `true` and `false` instead of `True` and `False`

[SkyfallWasTaken]

Quick Summary: ??? When using true instead of True, you get this error:

> true
-- NAMING ERROR ---------------------------------------------------------- /repl

I cannot find a `true` variable:

3|   true
     ^^^^
These names seem close though:

    e
    tan
    turns
    abs

Hint: Read <https://elm-lang.org/0.19.1/imports> to see how `import`
declarations work in Elm.

It should probably recommend using True or False instead.

SSCCE

True

• Elm: 0.19.1 (I think?)
• Browser: Firefox
• Operating System: Pop!_OS

Additional Details

N/A

[github-actions[bot]]

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[lue-bird]

In general, recommending imported exposed variants as well is helpful