Update README.md

README.md

 Platform configurations for Mochi
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-This repository provides Spack configuration files,
-example job scripts, and notes about building and
-running Mochi-based codes on various platforms.
+This repository provides Spack configuration files, example job scripts, and
+notes about building and running Mochi-based codes on various platforms.
+Please refer to your platform of interest for more information.
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