Update README.md

README.md

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 ## Why RisingWave for stream processing?
-RisingWave adaptly addresses some of the most challenging problems in stream processing. Compared to existing stream processing systems like [Apache Flink](https://flink.apache.org/), [Apache Spark Streaming](https://spark.apache.org/docs/latest/streaming-programming-guide.html), and [KsqlDB](https://ksqldb.io/), RisingWave stands out in two primary dimensions: **simplicity** and **efficiency**, thanks to its **[PostgreSQL](https://www.postgresql.org/)-style interaction experience** and  **[Snowflake](https://snowflake.com/)-like architectual design** (i.e., compute-storage decoupling and tiered storage).
+RisingWave adaptly addresses some of the most challenging problems in stream processing. Compared to existing stream processing systems like [Apache Flink](https://flink.apache.org/), [Apache Spark Streaming](https://spark.apache.org/docs/latest/streaming-programming-guide.html), and [KsqlDB](https://ksqldb.io/), RisingWave stands out in two primary dimensions: **simplicity** and **efficiency**, thanks to its **[PostgreSQL](https://www.postgresql.org/)-style interaction experience** and  **[Snowflake](https://snowflake.com/)-like architectual design** (i.e., compute-storage decoupling).
 ### Simplicity
 * **Simple to learn**
   * RisingWave speaks PostgreSQL-style SQL, enabling users to dive into stream processing in much the same way as operating a PostgreSQL database.