Merge pull request #306 from inbo/pr_template

Update PR template

Author: florisvdh

.github/pull_request_template.md

@@ -33,13 +33,14 @@ for an explanation on how to use task lists-->
 ## Previewing the pull request
 
 Thanks to GitHub Actions, an artifact (=zip file) of the rendered website is automatically created for each pull request.
+This provides a way to preview how these updates will look on the website, useful to contributors and reviewers.
 
-### Instructions
+### Instructions to preview the updated website
 
 1) On the PR page, you can find a "details" link under "checks - On PR, build the site and ...". Go there, click on the top link in the left sidebar ("Summary"), and download the generated artifact at the bottom of the page.
 2) Decompress it and make sure the target directory is called 'tutorials' (you may need to rename it)
 3) From the parent directory (just above the `tutorials` folder you created/renamed), run `python -m http.server 8887`, _or_ launch the Google Chrome [Web Server app](https://chrome.google.com/webstore/detail/web-server-for-chrome/ofhbbkphhbklhfoeikjpcbhemlocgigb) and point it at the parent directory.
 4) Point your browser to http://localhost:8887/tutorials.
-5) Review the updated website and accept/refuse/comment the PR
+5) Review the updated website. As a contributor, you can push extra commits to update the PR. As a reviewer, you can accept/refuse/comment the PR.
 
-**Note: for step 3, you can use any other simple HTTP server to serve the current directory if you don't have a Python 3 environment or Google Chrome available.**
+**Note: for step 3, you can use any other simple HTTP server to serve the current directory if you don't have a Python 3 environment or Google Chrome available.**