doc: Update GitHub repository webhook doc

[ViacheslavKudinov]

Resolves #3285

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Before the change?

• it were used different names of the repo and webhook ID in the documentation and examples

After the change?

• for clarity in all the places of doc are used the same repo name and webhook ID

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[deiga]

Your commit history in this PR seems off :/

Instead of needing to explain foo-org and foo what if we change them to example-owner and example-repo?

[ViacheslavKudinov]

Your commit history in this PR seems off :/

Instead of needing to explain foo-org and foo what if we change them to example-owner and example-repo?

updated, hope its better