Change "'setup-env' tool" to "'setup-env' script"

Co-authored-by: Nick <[email protected]>

Author: michaelsaki

CONTRIBUTING.md

@@ -46,7 +46,7 @@ There are a few ways to do this, but we prefer to use
 create and manage a Python virtual environment specific to this
 project.
 
-We recommend using the `setup-env` tool located in this repository,
+We recommend using the `setup-env` script located in this repository,
 as it automates the entire environment configuration process. The
 dependencies required to run this tool are
 [GNU `getopt`](https://github.com/util-linux/util-linux/blob/master/misc-utils/getopt.1.adoc),