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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• [x] For content changes, I have completed the self-review checklist.

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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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. :zap: For more information about linking issues, see "Linking a pull request to an issue".

I'll get this triaged for review :zap:

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