Minor improvements to count docstring

[cgnorthcutt]

changes to docstrings

• Add params to joint.
• link calibrate to joint.
• make order of params match signature
• add type on docstring return

[codecov]

Codecov Report

Merging #190 (3a1f038) into master (35fdebb) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
- Coverage   95.68%   95.56%   -0.13%     
==========================================
  Files          10       10              
  Lines         812      812              
  Branches      175      175              
==========================================
- Hits          777      776       -1     
  Misses         12       12              
- Partials       23       24       +1     

Impacted Files	Coverage Δ
cleanlab/count.py	95.00% <ø> (ø)
cleanlab/filter.py	93.12% <0.00%> (-0.63%)	⬇️

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[anishathalye]

LGTM, will do cleanup in my mega docs PR.