Remove conda forge testing in release documentation

[gsheni]

No description provided.

[codecov]

Codecov Report

Merging #1811 (547f018) into main (6926ab6) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1811      +/-   ##
==========================================
+ Coverage   98.67%   98.73%   +0.06%     
==========================================
  Files         141      141              
  Lines       15722    15722              
==========================================
+ Hits        15513    15523      +10     
+ Misses        209      199      -10     

Impacted Files	Coverage Δ
featuretools/tests/conftest.py	100.00% <0.00%> (+0.40%)	⬆️
...utational_backend/test_calculate_feature_matrix.py	99.45% <0.00%> (+0.65%)	⬆️
...computational_backends/calculate_feature_matrix.py	99.15% <0.00%> (+0.84%)	⬆️

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