Handle multiple C{type} in an epytext docstring

[AWhetter]

Reading the following docstring

"""
Blah

:Parameters:
    arg1 :C{string} or C{int}
        Does something
"""

results in the following Google docstring

"""Blah

Args:
    arg1 (string} or C{int): Does something
"""

It looks like something is greedily looking for C{} but it needs to be more conservative.