Update peering-with-content-providers.md

[Hugo-Trentesaux]

deduplicate word "add"

Describe your changes

the word "add" was appearing twice

Files changed

• docs/how-to/peering-with-content-providers.md

What issue(s) does this address?

Does this update depend on any other PRs?

Checklist before requesting a review

• [ ] Passing the beta version of the Check Markdown links for modified files check. Action results can be viewed here.

Checklist before merging

• [ ] Passing all required checks (The beta Check Markdown links for modified files check is not required)

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