Merge pull request #6481 from terminalmage/docs

Add fix for #6464 to 0.16.2 release notes
Add unmounted function to the mount state.

Add the ability to unmount a directory from the filesystem.
Merge pull request #6482 from jesusaurus/feature/unmount

Add unmounted function to the mount state.
Don't require opts in unmounting
Fix rst syntax in 0.16.2 release notes