Doc : Add errors from API handling examples

[seblegall]

Fix Issue #582

I found out, by reading the source code, that aws-amplify is using Axios to handle http calls. This choice introduce a particular way of manage errors coming from API comparing to Fetch. (see this issue )

This PR is a proposal for explicitly tell developers that Axios is used.

By doing this, it also makes much clearer the use of an init object (called myInit in the examples) as a parameter of the get(), post(), etc. methods. This object is indeed, at the end, the documented param parameter in the corresponding methods in Axios.

It also warn the developers that status code > 299 are thrown as an exception. Which is not obvious when using Fetch.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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