Change path for generated python client docs

[voetberg]

Closes #414

Changing the paths variable appends the given source path during documentation generation (according to the mkdocstrings documentation)

Verified by this worked by adding an annoying little comment in the local rucio clone

...
class AccountClient(BaseClient):

    """Account client class for working with rucio accounts
    
    I am being annoying and testing some changes just by messing around here. 
    """

    ACCOUNTS_BASEURL = 'accounts'
...

And verifying it shows up in the generated docs