Update intro.md

Author: ViktarStarastsenka

src/ds/json/intro.md

@@ -14,4 +14,4 @@ Primary features include:
 OR \
 [RedisJSON](https://github.com/RedisJSON/RedisJSON/) >=2.6.8 \
 OR \
-A free Redis instance on [Redis Cloud](https://redis.io/try-free/?utm_source=redisinsight&utm_medium=app&utm_campaign=timeseries_tutorial).
+A free Redis instance on [Redis Cloud](https://redis.io/try-free/?utm_source=redisinsight&utm_medium=app&utm_campaign=json_tutorial).