fix(docs): update `tolerance` description in `DbscanValidParams`

[grevgeny]

Fix the tolerance description in DbscanValidParams to clearly state that it represents the maximum distance between two points to be considered neighbors. This improves clarity in the documentation.

[codecov-commenter]

Codecov Report

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

Project coverage is 34.75%. Comparing base (606f59c) to head (e68ea60). Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #358   +/-   ##
=======================================
  Coverage   34.75%   34.75%           
=======================================
  Files          96       96           
  Lines        6324     6324           
=======================================
  Hits         2198     2198           
  Misses       4126     4126           

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