Improve example description

[theofpa]

What this PR does / why we need it:
Improve the get_online_features description in the hello-world example.

Which issue(s) this PR fixes:

Fixes #1544

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: theofpa
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Hi @theofpa. Thanks for your PR.

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[woop]

Thanks for this @theofpa. We're busy moving these examples out of the main repository since they are built for Feast 0.9. I'll be creating a new repository with the examples shortly.

Added them here: https://github.com/feast-dev/feast-spark-examples