The "hg diff" output is a bit much so here's a summary:

- simply typos like: 'occur' -> 'occurs'
- 'overriden' -> 'overridden' in more than one file
- 'formated' -> 'formatted' in more than one file
- 'Null' -> 'null' in more than one file
- 'etc' should be 'etc.' consistently
- 'e.g.' should be 'e.g.,' consistently
- 'i.e.' used where 'e.g.,' should be used
- consistency in phrasing
- missing summary line in Level.toString()
- incorrect possessives
- a couple of grammar fixes