day 1, 03. RMarkdown. Minor edits and figure suggestion.

[luisDVA]

In some places header (in reference to the yaml preamble) is spelled "heather". Just a heads up.

When introducing templates for different journals, consider adding a composite figure to the materials showing the same input document rendered for various journals, as a more visual representation of the benefit of reproducible reporting using templates.

part of my JOSE review

[eliocamp]

In some places header (in reference to the yaml preamble) is spelled "heather". Just a heads up.

This was probably in honour of Heather Turner :P.