fix: Charmed-HPC -> Charmed HPC

[NucciTheBoss]

Pre-submission checklist

• I read and followed the CONTRIBUTING guidelines.
• I have ensured that the documentation tests complete successfully.

Summary of Changes

Fixing a small consistency error I noticed when reviewing the filesystem documentation. It should be Charmed HPC, not Charmed-HPC. I think this is a holdover from when we were still discussing how "Charmed HPC" should be written as a proper noun in our documentation.

[AshleyCliff]

Good catch, thanks!