Update Scratch.Rmd vignette

[davechilders]

• fix typos
• lm() uses ordinary (not ordinal) least squares

[codecov-io]

Codecov Report

Merging #239 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #239   +/-   ##
======================================
  Coverage    76.3%   76.3%           
======================================
  Files          38      38           
  Lines        2996    2996           
======================================
  Hits         2286    2286           
  Misses        710     710

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[topepo]

Thanks

[github-actions]

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