update_pr_template: additional suggestions*

by @florisvdh, #357

Author: falkmielke

.github/pull_request_template.md

@@ -29,8 +29,8 @@ for an explanation on how to use task lists-->
 - [ ] The filename of my tutorial or article is `index.md`. In case of an Rmarkdown tutorial I have knitted my `index.Rmd` to `index.md` (both files are pushed to the repo). 
 - `yaml` header:
     - [ ] *(recommended)* I am included as author in the `authors` yaml tag, using `[MY_AUTHOR_ID]`. An author information file exists in `<tutorials>/data/authors/<author>.toml`.
-    - [ ] I have added `categories` to the YAML header and my category tags are from the [list of category tags](https://github.com/inbo/tutorials/blob/master/static/list_of_categories)
-    - [ ] *(optional)* I have included `tags` in the YAML header (see the tags listed in the [tutorials website side bar](https://inbo.github.io/tutorials/) for tags that have been used before)
+    - [ ] I have added `categories` to the YAML header and my category tags are from the [list of categories](https://github.com/inbo/tutorials/blob/master/static/list_of_categories).
+    - [ ] I have included meaningful and applicable `tags` (i.e. keywords) in the YAML header to improve the visibility of the new tutorial (see the tags listed in the [tutorials website side bar](https://inbo.github.io/tutorials/)).
     - [ ] The `date` is in format `YYYY-MM-DD` and adjusted.
 - [ ] *(recommended)* I have previewed this PR locally (see steps below; ask previous contributors for help) and confirmed that the new content renders as expected.
 
@@ -44,7 +44,7 @@ This provides a way to preview how these updates will look on the website, usefu
 
 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 into a target directory, e.g. `Downloads/tutorials_preview`.
-3) To preview the website, use a program which can serve `http` sites on your local machine. One such option is [the `servr` package](https://github.com/yihui/servr) in R: `& '\C:\Program Files\R\R-4.4.2\bin\Rscript.exe' -e "servr::httd('./tutorials_preview')" -p8887` (*make sure to adjust the path to your `Rscript.exe`*).
+3) To preview the website, use a program which can serve `http` sites on your local machine. One such option is [the `servr` package](https://github.com/yihui/servr) in R: `& '\C:\Program Files\R\R-4.4.2\bin\Rscript.exe' -e "servr::httd('./tutorials_preview')" -p8887` (*make sure to adjust the path to your `Rscript.exe`*; on Linux, simply use `Rscript -e [...]`).
 4) Point your browser to http://localhost:8887.
 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.