issue2550966: fix suboptimal links in docs. I think I got the majority of them. Some links still don't resolve because they are gone and there is no replacement afaict. Also the check is picking up example links like: https://.../rest and http://localhost:8017/... which should not be checked but are.

try:
    # Python 2.
    my_input = raw_input
except NameError:
    # Python 3+.
    my_input = input