Fixed: "--" in "Securing your webhooks" topic (#22874)

[abhinandanwadwa]

Why:

Closes #22874

What's being changed (if available, include any code snippets, screenshots, or gifs):

Reference Issue - #22874

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Content directory changes

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Source	Preview	Production	What Changed
developers/webhooks-and-events/webhooks/securing-your-webhooks.md	fpt ghec ghes@ 3.7 3.6 3.5 3.4 3.3 ghae	fpt ghec ghes@ 3.7 3.6 3.5 3.4 3.3 ghae

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

@abhinandanwadwa Thanks so much for opening a PR!

I have edited your original message so that it will automatically link to the issue. ⚡ For more information about linking issues, see "Linking a pull request to an issue".

I'll get this triaged for review ⚡

[felicitymay]

Thanks for fixing this issue. I've added a suggestion to fix the spacing around the new parentheses. I'll commit that and your PR should be ready to merge after the tests complete.

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