Add link to stanford healh policy data science lab code review guide

Author: Aariq

pages/wg/code-review.md

@@ -36,6 +36,7 @@ on the US-RSE slack.
 - [Code review training module](https://intersect-training.org/Code-Review/)
 - ["How to do Code Reviews Like a Human"](https://www.youtube.com/watch?v=0t4_MfHgb_A) (lecture recording)
 - ["Contemporary Peer Code Review Practices in Research Software"](https://carver.cs.ua.edu/Slides/2019/CodeReviewTutorial/TutorialSlides.pdf) (slides)
+- [Stanford Health Policy Data Science Lab guidelines on code review](https://stanfordhpds.github.io/lab_manual/chapters/08-code-review.html)
 
 ### Automated Code Review Tools
 
@@ -52,4 +53,4 @@ on the US-RSE slack.
 - [rOpenSci](https://ropensci.org/software-review)
 - [pyOpenSci](https://www.pyopensci.org/)
 - [JOSS](https://joss.theoj.org/)
-- [DHTech](https://dhcodereview.github.io/)
+- [DHTech](https://dhcodereview.github.io/)