Improve ERC-1363 documentation

[Amxx]

Fixes #4631 (comment)

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[vittominacori]

Also _checkOnTransferReceived and _checkOnApprovalReceived have the documentation issue.

[vittominacori]

The param name is wrong there, anyway I will keep the requirements section only on the _check* methods or only in the high level ones to avoid duplications.

[ernestognw]

Thanks for pointing out @vittominacori!