Example Usage of GraknOptions is undocumented for client-python

[jmsfltchr]

Description

It was necessary to refer to the source code to see how to use GraknOptions in Python.

Location of Content

http://dev.docs.grakn.ai/docs/client-api/python#options

Expected Content

The section should be called GraknOptions not options and how best to create and provide the object.

[izmalk]

Now we have TypeDB Options in the Options section https://docs.vaticle.com/docs/client-api/python#options. It says 'Use TypeDBOptions.core()' on how to instantiate it. Also, we will improve it in terms of adding an example - #551.