Update scopes.rst

Error in XML
bug #3863 Error in XML (tvlooy)

This PR was merged into the 2.3 branch.

Discussion
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Error in XML

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets |

Commits
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fb179c0 Update scopes.rst