zram: update documentation
Several documentation changes. First, we never mentioned any errors and never required any error checks in documentation. Second, mention that there is another way to configure and manage zram devices -- zramctl, provided by util-linux. Third, add a bit of clarification on why `mem_used_max' attr is RW and correct some typos. Signed-off-by: NSergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: NJonathan Corbet <corbet@lwn.net>
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