Update preprecossing/_qc.py:describe_var

[WeilerP]

Description

Use f-strings instead of replace.

• Closes scanpy.preprocessing.describe_var does not use f-strings #3397.
• Tests included or not required because: Already covered.

• Release notes not necessary because: Minor change.

[WeilerP]

I didn't add any release notes since the change is minor. Let me know if you want me to add some nonetheless.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.58%. Comparing base (ef92866) to head (6be0dbc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3398      +/-   ##
==========================================
- Coverage   76.59%   76.58%   -0.01%     
==========================================
  Files         111      111              
  Lines       12874    12870       -4     
==========================================
- Hits         9861     9857       -4     
  Misses       3013     3013              

Files with missing lines	Coverage Δ
src/scanpy/preprocessing/_qc.py	81.81% <100.00%> (-0.41%)	⬇️

[ilan-gold]

Done in #3325

[flying-sheep]

Thanks for the PR! I happened to do the same thing in another PR one week or so earlier