docs: Add rerun.io to known users guide (#17825)

* docs: Add rerun.io to known users guide

I am trying to spread the word of all the systems that use DataFusion

FYI @emilk and @timsaucer

* Update docs/source/user-guide/introduction.md

* Update docs/source/user-guide/introduction.md

Co-authored-by: Tim Saucer <timsaucer@gmail.com>

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Co-authored-by: Tim Saucer <timsaucer@gmail.com>

Author: alamb

docs/source/user-guide/introduction.md

@@ -121,6 +121,7 @@ Here are some active projects using DataFusion:
 - [Polygon.io](https://polygon.io/) Stock Market API
 - [qv] Quickly view your data
 - [R2 Query Engine](https://blog.cloudflare.com/r2-sql-deep-dive/) Cloudflare's distributed engine for querying data in Iceberg Catalogs
+- [rerun.io](https://rerun.io/) Visualize and query robotics logs and transform them into training data.
 - [Restate](https://github.com/restatedev) Easily build resilient applications using distributed durable async/await
 - [ROAPI] Create full-fledged APIs for slowly moving datasets without writing a single line of code
 - [Sail](https://github.com/lakehq/sail) Unifying stream, batch and AI workloads with Apache Spark compatibility