fix(docs): fix broken link to ensure the docs can be built

[yurijmikhalevich]

What does this PR do?

This PR fixes the error preventing docs from being built:

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cc @Borda

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 lightning_app: Docs

Check ID	Status
docs-make (app, doctest)	success	✅
docs-make (app, html)	success	✅

These checks are required after the changes to docs/source-app/glossary/restful_api/restful_api.rst, docs/source-app/workflows/build_rest_api/index.rst.

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Thank you for your contribution! 💜

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[lantiga]

Great!