update reasoning for Rust and Cargo installation (#7825)

docs/project/contributing.md

@@ -43,7 +43,7 @@ Our [Go release workflow](https://github.com/treeverse/lakeFS/blob/master/.githu
    1. Java 8
       * Apple M1 users can install this from [Azul Zulu Builds for Java JDK](https://www.azul.com/downloads/?package=jdk). Builds for Intel-based Macs are available from [java.com](https://www.java.com/en/download/help/mac_install.html).
    1. *Optional* - [PostgreSQL 11](https://www.postgresql.org/docs/11/tutorial-install.html) (useful for running and debugging locally)
-   1. *Optional* - [Rust & Cargo](https://www.rust-lang.org/tools/install) (only needed if you want to build the Delta Lake diff plugin)
+   1. *Optional* - [Rust & Cargo](https://www.rust-lang.org/tools/install) (useful for building the Rust SDK)
    1. *Optional* - [Buf CLI](https://buf.build/docs/installation) (only needed if you like to update Protocol Buffer files)
 
 1. [Clone](https://github.com/git-guides/git-clone) the [repository from GitHub](https://github.com/treeverse/lakeFS).