Handle is_final and endpointing together with utterance end + clean u…

[DamienDeepgram]

…p the output so it's easier to follow

Proposed changes

This is an improved version to make it easier to understand the docs here

Users tend to not understand how to handle these things and our samples do not include how it works

Types of changes

What types of changes does your code introduce to the community Python SDK?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update or tests (if none of the other choices apply)

[davidvonthenen]

Other than the one comment, this looks good!

[davidvonthenen]

If you rebase/squash, I can approve and merge.