docs: Describe code sample more specifically

[cbonnie]

docs: This is just a simple PR to better describe what the code is doing in the comments.

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• [ x] Appropriate docs were updated (if necessary)

Fixes #661 🦕

[cojenco]

@cbonnie Thanks for updating the code sample description to be more specific.

Looking at where the sample is linked on c.g.c alongside other languages, would it make more sense to instead add comments/variables location="us" and storage_class="COLDLINE" so that the variables are shown to be optional and configurable. WDYT?

[leahecole]

i love PRs like this. Teeny change to make something more helpful!

[cbonnie]

@cojenco Hm, not quite sure I understand - could you show me what the change would look like?

@leahecole Thank you!