Remove remaining axisTitleData references

[JoshMart]

There are old references to the outdated axisTitleData in the docs and in some code comments after it was removed. Two issues were opened to ask about these missing properties: #1259 and #1201. This PR cleans up all remaining code and doc references to axisTitleData.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.52%. Comparing base (930ac12) to head (fa40aaf).
Report is 8 commits behind head on main.

❗ Current head fa40aaf differs from pull request most recent head 3d803d8. Consider uploading reports for the commit 3d803d8 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1596   +/-   ##
=======================================
  Coverage   87.52%   87.52%           
=======================================
  Files          45       45           
  Lines        3078     3078           
=======================================
  Hits         2694     2694           
  Misses        384      384           

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[imaNNeo]

Thank you so much!
It's ready to be merged. Please resolve the CHANGELOG conflict first.

[JoshMart]

Thank you so much! It's ready to be merged. Please resolve the CHANGELOG conflict first.

You got it. Conflicts should be resolved now.

[imaNNeo]

Sorry, I just updated the CHANGELOG some minutes ago, so I saw the conflict here again and I tried to fix it. But it seems it isn't fixed, can you please revert your change in the CHANGELOG?
I will write it by myself.