feat(lesson): pep8, linters & code formatters

clean-modular-code/intro-clean-code.md

@@ -63,7 +63,7 @@ After completing this lesson, you will be able to:
 * Apply the PEP 8 Style Guide standards to your **Python** code.
 :::
 
-"Pythonic" code is code that follows the conventions and best practices of the Python programming language. It emphasizes code that is clear, concise, and readable--principles that adhere to Python's design philosophy.
+"Pythonic" code follows the conventions and best practices of the Python programming language. It emphasizes clear, concise, and readable code—the principles of Python's design philosophy. 
 
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 Pythonic code also takes full advantage of Python's features which include: