Update rclone.md

docs/compute/rclone.md

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-## Use rclone to back up directory to PetaLibrary
+## Using _rclone_ to back up a local directory to PetaLibrary
 
 This is a guide to making a backup of a local directory on your laptop or lab server to a PetaLibrary allocation. The method employs the software _rclone_, which is available for many architectures. While the following tutorial is tailored for a MacOS user, the general steps to follow are the same and are relevant for Windows and Linux users too.