Minor wording correction.

doc/source/PreConfiguredSites.rst

@@ -548,7 +548,7 @@ The following instructions install a new spack environment on a pre-configured s
    # Ensure Python 3.6+ is available and the default before sourcing spack.
    # Note this is only used for building the environment. Once the
    # environment is built, spack-stack provides the proper python
-   # executable which needs to be used to build applications with the
+   # executable which needs to be utilized to build applications with the
    # newly created environment.
 
    # Sources Spack from submodule and sets ${SPACK_STACK_DIR}