Bug fix hydrogenic gdos k edge

[daenjannis]

Description of the change

Bug fix for the gdos of the hydrogen k edge.

Progress of the PR

• Change implemented (can be split into several points),
• update docstring (if appropriate),
• update user guide (if appropriate),
• add an changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting changelog entry in the readthedocs doc build of this PR (link in github checks)
• add tests,
• ready for review.

[codecov]

Codecov Report

Merging #2859 (1a96dc7) into RELEASE_next_patch (6cf2351) will not change coverage.
The diff coverage is 100.00%.

@@                 Coverage Diff                 @@
##           RELEASE_next_patch    #2859   +/-   ##
===================================================
  Coverage               75.68%   75.68%           
===================================================
  Files                     202      202           
  Lines                   30113    30113           
  Branches                 6578     6578           
===================================================
  Hits                    22791    22791           
  Misses                   5586     5586           
  Partials                 1736     1736           

Impacted Files	Coverage Δ
hyperspy/misc/eels/hydrogenic_gos.py	92.78% <100.00%> (ø)

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[francisco-dlp]

Great, thanks!

Fixes #2854