Documentation about the difference between accessing the HRE implicitly from global or explicitly

[alcuadrado]

You have two ways of accessing the HRE in Hardhat: implicitly (from global), or explicitly (importing it / as a task param).

Our documentation is very inconsistent about this, and it can lead to confusion to users, and to PRs like #1753 or this one that increase the inconsistency even further.

We should come up with a unified way of explaining this (e.g. always access things implicitly), apply it everywhere, and create a section in the documentation explaining each way of doing things and their limitations..

[github-actions[bot]]

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