Merge pull request #3125 from zaki-hussain/fix-typo

Fixed typos by adding spaces after commas

_articles/how-to-contribute.md

@@ -87,7 +87,7 @@ Even if you like to write code, other types of contributions are a great way to
 
 ### Do you like to write?
 
-* Write and improve the project's documentation,[like @CBID2 did for OpenSauced's documentation](https://github.com/open-sauced/docs/pull/151)
+* Write and improve the project's documentation, [like @CBID2 did for OpenSauced's documentation](https://github.com/open-sauced/docs/pull/151)
 * Curate a folder of examples showing how the project is used
 * Start a newsletter for the project, or curate highlights from the mailing list, [like @opensauced did for their product](https://news.opensauced.pizza/about/)
 * Write tutorials for the project, [like PyPA's contributors did](https://github.com/pypa/python-packaging-user-guide/issues/194)
@@ -209,7 +209,7 @@ Open source isn't an exclusive club; it's made by people just like you. "Open so
 
 You might scan a README and find a broken link or a typo. Or you're a new user and you noticed something is broken, or an issue that you think should really be in the documentation. Instead of ignoring it and moving on, or asking someone else to fix it, see whether you can help out by pitching in. That's what open source is all about!
 
-> According to a study conducted by Igor Steinmacher and other Computer Science researchers,[28% of casual contributions](https://www.igor.pro.br/publica/papers/saner2016.pdf) to open source are documentation, such as  typo fixes, reformatting, or writing a translation.
+> According to a study conducted by Igor Steinmacher and other Computer Science researchers, [28% of casual contributions](https://www.igor.pro.br/publica/papers/saner2016.pdf) to open source are documentation, such as  typo fixes, reformatting, or writing a translation.
 
 If you're looking for existing issues you can fix, every open source project has a `/contribute` page that highlights beginner-friendly issues you can start out with. Navigate to the main page of the repository on GitHub, and add `/contribute` at the end of the URL (for example [`https://github.com/facebook/react/contribute`](https://github.com/facebook/react/contribute)).