Removed non-existent sections from the ToC.
Use `strong` instead of `retain` in code example
Merge pull request #31 from yas375/patch-1

Use `strong` instead of `retain` in code example
Change i.e.'s to e.g.'s

i.e. means, essentially, "in other words." Use this to clarify meaning.

e.g. means "for example." Use this to provide an example (of many possible examples).

Signed-off-by: Andrew Phelps <andrew@phel.ps>
Fix commas

Signed-off-by: Andrew Phelps <andrew@phel.ps>
Remove space before link

Signed-off-by: Andrew Phelps <andrew@phel.ps>
Merge pull request #34 from phelps/master

Trivial copy edits