Update outreachy_guidelines.md

Fixed a few small typos, added link to GitHub docs on pull requests

.github/outreachy_guidelines.md

@@ -7,8 +7,8 @@ Welcome aboard, Outreachy intern! 🙌
 2. Read our companion MolEvolvR web-app preprint [here](https://doi.org/10.1101/2022.02.18.461833).
 3. Follow instructions from the repo `README` to install `MolEvolvR`.
 4. Make sure you can build the package with `R CMD build` or run tests with `devtools`.
-5. Check out [open issues](https://github.com/JRaviLab/MolEvolvR/issues) elect a task [labeled Outreachy](https://github.com/JRaviLab/MolEvolvR/issues?q=is%3Aissue+is%3Aopen+label%3Aoutreachy) and ask to be assigned to it.
-6. Create a branch for the specific task and submit a PR (pull request), and respond to any feedback from reviewers.
+5. Check out [open issues](https://github.com/JRaviLab/MolEvolvR/issues), select a task [labeled Outreachy](https://github.com/JRaviLab/MolEvolvR/issues?q=is%3Aissue+is%3Aopen+label%3Aoutreachy), and ask to be assigned to it.
+6. Create a branch for the specific task and submit a PR (["pull request"](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests)), and respond to any feedback from reviewers.
 
 ## Resources
 - 💻[How to Code](https://jravilab.github.io/lab_docs/howto.html#code)