Slight tweak to mount/umount for clarity

[kazoni]

What type of PR is this? (check all applicable)

• [ ] ♻️ Refactor
• [ ] ✨ New Chapter
• [ ] 🐛 Bug Fix/Typo
• [ ] 👷 Optimization
• [X] 📝 Documentation Update
• [ ] 🚩 Other

Description

Made slight wording change to the summary in README for mount/umount for readability and to make the formats match (i.e. command by itself, then command with example arguments).

Related Tickets & Documents

Added to documentation?

• [x] 📜 readme
• [ ] 🙅 no documentation needed

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