update ingest python doc (#1446)
### Description
Updating the python version of the example docs to show how to run the
same code that the CLI runs, but using python. Rather than copying the
same command that would be run via the terminal and using the subprocess
library to run it, this updates it to use the supported code exposed in
the inference directory.
For now only the wikipedia one has been updated to get some opinions on
this before updating all other connector docs.
Would close out
https://github.com/Unstructured-IO/unstructured/issues/1445
