Fix documentation link to hyperspy 2.0 documentation

[ericpre]

Update web links following hyperspy 2.0 release.

Progress of the PR

• [n/a] update docstring (if appropriate),
• [x] update user guide (if appropriate),
• [x] add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• [x] Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:rosettasciio build of this PR (link in github checks)
• [n/a] add tests,
• [x] ready for review.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (94f9aa9) 86.21% compared to head (21fc577) 86.22%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #210 +/- ## ========================================== + Coverage 86.21% 86.22% +0.01% ========================================== Files 82 82 Lines 10552 10549 -3 Branches 2293 2293 ========================================== - Hits 9097 9096 -1 + Misses 935 933 -2 Partials 520 520 ```

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