More <changes> in the documentation based on feedb...

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[Alejandro Serrano.Mena]

More changes in the documentation based on feedback, this time for the Typed errors section. The goal is to minimize what readers need to understand in order to be proficient with the DSL, and clarify the things like "understanding the difference between Either and Ior" are optional. As usual, any feedback is welcome

[strindberg]

In the file "working-with-typed-errors.md", there is this sentence added: "One important difference, though, is that when the computation returns a value, you must use by (property delegation) instead of = to obtain the value." I do not understand it, and I cannot connect it to the code examples following it. Is there perhaps a way to make it more clear what the meaning is?