add react native alias

[rtrieu]

What does this PR do? What is the motivation?

Adds an alias to the React Native setup page.

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/rtrieu/docs-12603-add-rum-alias/real_user_monitoring/application_monitoring/react_native/setup/reactnative

[urseberry]

This looks fine, but I'd also like to know why you need to add the alias.

[rtrieu]

@urseberry it should have been added during this reorg: #31874. this was to address a hotjar comment complaining it was broken (they were trying to visit the old URL).