Fixed typos in appendix A

content/A-learning-programming/01-introduction.md

...ent/A-learning-programming/02-natural-born-programmers.md

...t/A-learning-programming/04-the-new-science-of-learing.md

...t/A-learning-programming/06-developmental-epistemology.md

content/A-learning-programming/07-summary.md