[Test] Increase the test coverage

[kozistr]

Problem (Why?)

heading to coverage 98%

Solution (What/How?)

• update test_no_gradient

Other changes (bug fixes, small refactors)

• fix API documentation

Notes

nope

[codecov-commenter]

Codecov Report

Merging #91 (98afcac) into main (503ad2e) will increase coverage by 0.91%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   96.75%   97.66%   +0.91%     
==========================================
  Files          33       33              
  Lines        2401     2401              
==========================================
+ Hits         2323     2345      +22     
+ Misses         78       56      -22     

Impacted Files	Coverage Δ
pytorch_optimizer/optimizer/sam.py	100.00% <ø> (+3.38%)	⬆️
pytorch_optimizer/optimizer/sgdp.py	100.00% <ø> (ø)
pytorch_optimizer/optimizer/ranger21.py	98.90% <0.00%> (+0.54%)	⬆️
pytorch_optimizer/optimizer/adabelief.py	97.29% <0.00%> (+0.90%)	⬆️
pytorch_optimizer/optimizer/ranger.py	100.00% <0.00%> (+1.96%)	⬆️
pytorch_optimizer/optimizer/ralamb.py	100.00% <0.00%> (+2.50%)	⬆️
pytorch_optimizer/optimizer/nero.py	100.00% <0.00%> (+3.07%)	⬆️
pytorch_optimizer/optimizer/radam.py	100.00% <0.00%> (+3.29%)	⬆️
pytorch_optimizer/optimizer/diffrgrad.py	100.00% <0.00%> (+4.04%)	⬆️
... and 1 more

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