Doc consistency related to #143

[topepo]

Make sure all comments in doc files and stop

• have functions as foo() instead of foo

• use backticks for argument names (e.g. not 'bar')

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@7e69c55). Click here to learn what that means.
The diff coverage is 18.18%.

@@            Coverage Diff            @@
##             master     #151   +/-   ##
=========================================
  Coverage          ?   73.17%           
=========================================
  Files             ?       35           
  Lines             ?     2587           
  Branches          ?        0           
=========================================
  Hits              ?     1893           
  Misses            ?      694           
  Partials          ?        0

Impacted Files	Coverage Δ
R/arguments.R	66.19% <ø> (ø)
R/engines.R	80% <ø> (ø)
R/mars.R	75.72% <ø> (ø)
R/mlp.R	77.33% <ø> (ø)
R/boost_tree.R	84.46% <ø> (ø)
R/translate.R	73.68% <ø> (ø)
R/rand_forest.R	77.61% <ø> (ø)
R/svm_poly.R	83.07% <ø> (ø)
R/surv_reg.R	50.7% <ø> (ø)
R/linear_reg.R	73.86% <ø> (ø)
... and 15 more

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[github-actions]

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