Merge branch 'proofing' into 'master'
Proofing - Fixed various typos and grammar issues. - Some mis-wording and re-wording fixes. - Fixed headings structure (on Styleguide page). - Unify and fix lists and punctuations. In the last commit I've also added some re-wording suggestions, which sound better to me, but you're obviously free to let me know if you prefer to keep them as is. Also, regarding British vs. American English, I honestly prefer British, but many words online these days are American English and have become very engrained in that way. For that reason I haven't touched those and left them as is. (e.g. customize, organize, authorize, etc.) See merge request !137