Fix intersphinx link in changelog

[jlaehne]

Fix link to [holospy.signals.HologramImage.statistics](https://hyperspy.org/holospy/api/signals.html#holospy.signals.HologramImage.statistics) in changelog that yielded warning when building the documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.50%. Comparing base (a2dde1f) to head (bb4b947).
Report is 5 commits behind head on RELEASE_next_patch.

Additional details and impacted files

@@                  Coverage Diff                   @@
##           RELEASE_next_patch    #3354      +/-   ##
======================================================
- Coverage               80.52%   80.50%   -0.02%     
======================================================
  Files                     147      147              
  Lines                   21876    21876              
  Branches                 5149     5149              
======================================================
- Hits                    17615    17612       -3     
- Misses                   3043     3045       +2     
- Partials                 1218     1219       +1     

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