Update result.gleam to clarify try and add examples of use

I found result.try confusing when I had not realized that it could "replace" an `Ok` with an `Error`. I also did not understand its use in function chaining because I hadn't seen an example of a function call creating the result that it takes as input. This changes the language to offer a more specific description of what result.try does, and to show examples of use that will hopefully demonstrate its value more clearly.

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