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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.28%. Comparing base (a7a8b98) to head (7e2c9ee).
Report is 86 commits behind head on main.

Additional details and impacted files

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.