Split primitive descriptions on blank line instead of first line break to avoid truncating descriptions

[tamargrey]

Fixes #2217

[codecov]

Codecov Report

Merging #2219 (c315484) into main (31d80ab) will increase coverage by 44.70%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main    #2219       +/-   ##
===========================================
+ Coverage   54.58%   99.29%   +44.70%     
===========================================
  Files         146      146               
  Lines       17579    17594       +15     
===========================================
+ Hits         9596    17470     +7874     
+ Misses       7983      124     -7859     

Impacted Files	Coverage Δ
featuretools/primitives/utils.py	99.51% <100.00%> (+47.80%)	⬆️
...ools/tests/primitive_tests/test_primitive_utils.py	100.00% <100.00%> (+100.00%)	⬆️
featuretools/synthesis/deep_feature_synthesis.py	99.07% <0.00%> (+1.38%)	⬆️
...primitives/standard/rolling_transform_primitive.py	100.00% <0.00%> (+1.72%)	⬆️
...imitives/standard/datetime_transform_primitives.py	100.00% <0.00%> (+2.50%)	⬆️
featuretools/synthesis/utils.py	100.00% <0.00%> (+2.77%)	⬆️
...retools/primitives/standard/transform_primitive.py	100.00% <0.00%> (+2.97%)	⬆️
featuretools/utils/time_utils.py	95.16% <0.00%> (+3.22%)	⬆️
...rimitives/standard/latlong_transform_primitives.py	100.00% <0.00%> (+3.63%)	⬆️
featuretools/tests/testing_utils/es_utils.py	100.00% <0.00%> (+4.34%)	⬆️
... and 68 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.