KNN multi predict

[topepo]

For #176

The multi_predict methods are now documented in the same place too.

[codecov-io]

Codecov Report

Merging #183 into master will increase coverage by 0.09%.
The diff coverage is 90%.

@@            Coverage Diff            @@
##           master    #183      +/-   ##
=========================================
+ Coverage   75.81%   75.9%   +0.09%     
=========================================
  Files          37      37              
  Lines        3035    3055      +20     
=========================================
+ Hits         2301    2319      +18     
- Misses        734     736       +2

Impacted Files	Coverage Δ
R/predict.R	74.73% <ø> (ø)	⬆️
R/mars.R	75.72% <ø> (ø)	⬆️
R/linear_reg.R	78.64% <ø> (ø)	⬆️
R/logistic_reg.R	70.24% <ø> (ø)	⬆️
R/aaa.R	0% <ø> (ø)	⬆️
R/multinom_reg.R	78.37% <ø> (ø)	⬆️
R/boost_tree.R	84.65% <ø> (ø)	⬆️
R/nearest_neighbor.R	84.21% <90%> (+2.06%)	⬆️

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[github-actions]

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