Clarify and improve encryption documentation

- Remove the language that "all user data" is encrypted.  This is to
  avoid misunderstandings or arguments about what is "user data",
  especially in light of "user properties".
- Document that properties are unencrypted.
- Document that snapshot names are unencrypted.
- For consistency with the rest of the zfs.8 man page, use "ZFS" as the
  generic noun, not (bolded) "zfs".  The latter refers to the command.
  Likewise, use "ZFS" instead of "the kernel module".
- Give "a passphrase" as an example of a "user's key".

Reviewed-by: Tom Caputi <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Signed-off-by: Richard Laager <[email protected]>
Closes #8652 

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