The most significant change here is that explorer now uses the chosen spelling
rather than the old `Bool` spelling. Also update a few documentation examples
and some skeletal design docs to use the chosen spelling.
A Carbon function that needs to report recoverable failures should return a sum type whose alternatives represent the success case and failure cases, such as Optional(T), Result(T, Error), or Bool. The function's successful return
value, and any metadata about the failure, should be embedded in the alternatives of the sum type, rather than reported by way of output parameters or other side channels. Carbon's design will prioritize making this form of error handling efficient and ergonomic.
Co-authored-by: josh11b <josh11b@users.noreply.github.com>
Richard Smith
Geoff Romerandjosh11b