Update webhook-events-for-the-github-marketplace-api.md

[CraigThatcher]

The example given for the plan object key yearly_price_in_cents is only listing a single month cost instead of the full year. New example updated to show cost for a full year instead of a single month.

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Closes [issue link]

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Source	Preview	Production	What Changed
content/developers/github-marketplace/using-the-github-marketplace-api-in-your-app/webhook-events-for-the-github-marketplace-api.md	Modified	Original

[ramyaparimi]

@CraigThatcher
Thanks so much for opening a PR! I'll get this triaged for review ⚡

[ethanpalm]

Thanks for creating this PR, @CraigThatcher! Your change looks good to go. We'll get this merged once I have the branch up to date and all checks are passing.

Thanks for taking the time to improve the GitHub docs ⚡

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