Remove experimental feature tag for freud generate_bonds

[CalCraven]

PR Summary:

PR Checklist

---

• Includes appropriate unit test(s)
• Appropriate docstring(s) are added/updated
• Code is (approximately) PEP8 compliant
• Issue(s) raised/addressed?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.98%. Comparing base (faa92be) to head (6758a4f).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1249   +/-   ##
=======================================
  Coverage   85.98%   85.98%           
=======================================
  Files          53       53           
  Lines        4860     4860           
=======================================
  Hits         4179     4179           
  Misses        681      681           

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