Highlight docstrings as reStructuredText

[remcohaszing]

Since I noticed this plugin tries to detect SQL from strings in order to highlight them, I figured it might just as well highlight docstrings as reStructuredText. Also there is no need to detect if any docstrings could be highlighted as SQL.

This would affect:

• function docstrings
• class docstrings
• module docstrings
• sphinx property comments

"""
Module docstring.

"""
class A:
    """
    Class docstring

    """
    #: Property comment
    prop = 'prop'

    def __init__(self):
        """
        Function docstring

        """
        #: Property comment
        self.prop = 'prop'


def a():
    """
    Function docstring

    """


#: Property comment
prop = 'prop'