Where can I find the git repo for parts of the rstudio website?

I'd like to submit a pull request with some typo-fixes to documentation on the rstudio website. Where can i find the github repository to make a contribution?

Specifically, this page: Chapter 15 Parameterized reports | R Markdown: The Definitive Guide

The RStudio GitHub account can be found here: https://github.com/rstudio

There are ~200 repositories, so it might take some time to find what you're looking for, assuming that the site is available on GitHub.

The site is in the rmarkdown repository but in the gh-page branches

and the file your looking for
https://github.com/rstudio/rmarkdown/blob/gh-pages/developer_parameterized_reports.Rmd

thanks @cderv and @jessemaegan! edits and pull request are made.