Misc updates

[topepo]

Better roxygen formatting and a new argument to the update functions.

[codecov-io]

Codecov Report

Merging #229 into master will increase coverage by 0.34%.
The diff coverage is 91.52%.

@@            Coverage Diff             @@
##           master     #229      +/-   ##
==========================================
+ Coverage   75.81%   76.15%   +0.34%     
==========================================
  Files          38       38              
  Lines        2931     2990      +59     
==========================================
+ Hits         2222     2277      +55     
- Misses        709      713       +4

Impacted Files	Coverage Δ
R/mars.R	75.49% <100%> (+0.74%)	⬆️
R/boost_tree.R	85.27% <100%> (+0.22%)	⬆️
R/rand_forest.R	78.46% <100%> (+1.04%)	⬆️
R/mlp.R	79.67% <100%> (+0.34%)	⬆️
R/svm_poly.R	85.93% <100%> (+0.69%)	⬆️
R/decision_tree.R	53.84% <100%> (+1.84%)	⬆️
R/surv_reg.R	42.85% <100%> (+2.55%)	⬆️
R/linear_reg.R	76.57% <100%> (+0.65%)	⬆️
R/multinom_reg.R	79.09% <100%> (+1.52%)	⬆️
R/logistic_reg.R	70.96% <100%> (+0.71%)	⬆️
... and 4 more

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[github-actions]

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