Fix broken link in the installing-viewer documentation (#5236)

Fix of missing rust link

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### What

### Checklist
* [ ] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [ ] I've included a screenshot or gif (if applicable)
* [ ] I have tested the web demo (if applicable):
* Using newly built examples:
[app.rerun.io](https://app.rerun.io/pr/5236/index.html)
* Using examples from latest `main` build:
[app.rerun.io](https://app.rerun.io/pr/5236/index.html?manifest_url=https://app.rerun.io/version/main/examples_manifest.json)
* Using full set of examples from `nightly` build:
[app.rerun.io](https://app.rerun.io/pr/5236/index.html?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
* [ ] The PR title and labels are set such as to maximize their
usefulness for the next release's CHANGELOG
* [ ] If applicable, add a new check to the [release
checklist](https://github.com/rerun-io/rerun/blob/main/tests/python/release_checklist)!

- [PR Build Summary](https://build.rerun.io/pr/5236)
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docs/content/getting-started/installing-viewer.md

@@ -25,4 +25,4 @@ The Rerun Viewer has built-in support for opening many kinds of files, and can b
 To start getting your own data logged & visualized in the viewer check one of the respective getting started guides:
 * [Python](python.md)
 * [C++](cpp.md)
-* [Rust](python.md)
+* [Rust](rust.md)