Change definition of summary/description break

In this commit I have made the following documentation changes:

- Changed short description to summary
- Changed long description to description
- Changed example mail address
- Changed definition when a summary breaks and becomes a description
  to match PSR-5 and actual usage.

See: https://github.com/phpDocumentor/ReflectionDocBlock/issues/34#issuecomment-49510977
I thought you were implementing @cebe's feedback here, which basically suggested listing abbreviations like "e.g." as a use case.

If that's the case, you want the "e.g." to NOT be a parenthetical phrase, but an actual example item. Without quotes, it will be a parenthetical phrase, and with them, it would become the example itself... ughh... this is so meta... I mean that with quotes, "e.g." is an actual example, and not a phrase meaning "e.g."... if that makes sense.


If you're not intending to add "e.g." as an example abbreviation, then sure. It could be left like that.