Documentation errors in base.py and test_docs.py

revA..revB &rarr; revA...revB (three instead of two dots) [base.py, line 467](https://github.com/gitpython-developers/GitPython/blob/master/git/repo/base.py#L467)

rorepo is a ~~a~~ Repo instance [test_docs.py, line 21](https://github.com/gitpython-developers/GitPython/blob/master/git/test/test_docs.py#L21)
