Add missing cli parameter to curl command

[gijswijs]

To see the returned HTTP headers of an API request using your app's client ID and secret,
you need to add the -I parameter.

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[github-actions]

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Content directory changes

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Source	Preview	Production	What Changed
content/rest/overview/resources-in-the-rest-api.md	Modified	Original

[ramyaparimi]

@gijswijs The PR has a lot more changes than adding -I to the curl command. Please revert back all the other changes and I will triage this for a review 💖 .

[gijswijs]

@ramyaparimi I see my Prettier formatter had a field day with that file. I forgot to turn it off.
I've reverted the commit, and added a new one with only that single change. I can make a different PR if that's easier. Just let me know.