docs: fix hist link, hide some useless private members

[ManuelHu]

• fix the link to the hist package in tutorial notebooks
• hide at least some common private members of abstract classes, that really nobody will use...

[codecov[bot]]

Codecov Report

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

Project coverage is 76.28%. Comparing base (a7a8b98) to head (7e2c9ee). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #104 +/- ## ======================================= Coverage 76.28% 76.28% ======================================= Files 46 46 Lines 3036 3036 ======================================= Hits 2316 2316 Misses 720 720 ```

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