docs: filesystems: vfs: actualize struct super_operations description

Added/updated descriptions for super_operations:
- free_inode method
- evict_inode method
- freeze_super/thaw_super method
- show_{devname,path,stats} procfs-related methods
- get_dquots method

Cc: Eric Biggers <[email protected]>
Cc: Miklos Szeredi <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Alexander Mikhalitsyn <[email protected]>
Reviewed-by: Christian Brauner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>

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