Typos

[SLarrick]

-TYPO: para text under H2 "Why Policy": "simple" should be "simply"
-TYPO: Para text under H2 "Drafting Policy Language", H3 “Learn from Examples”: "benefet" should be "benefit"
-TYPO: H3 “Build, Support and Enact” (Under H2 "Implementing policy") should be “Build Support and Enact” (no comma)