Update docs/source/projects/developer_tools.md

Co-authored-by: Chang Huan Lo <thisismade@live.com>

docs/source/projects/developer_tools.md

@@ -49,7 +49,7 @@ when multiprocessing, logging information about the git environment, command-lin
 ## Actions
 
 The actions repository hosts reliable, maintained and versioned [GitHub Actions](https://github.com/features/actions) 
-workflows for common tasks such as linting, testing and releasing Python projects to PyPI.
+workflows for common tasks such as linting, testing, and releasing Python projects to PyPI.
 
 
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