Add a 'description' property to docstrings

[pR0Ps]

Adds the ability to access the full description of a parsed docstring. This is the short description, an optional newline, and the long description added together.

[pR0Ps]

@rr- Anything else you'd like to see from this? I went with a method that uses a temporary list to collect up the string before joining it at the end because it made the logic easier to understand, but I could also write it in a way that skips the intermediary list if you prefer.