Misleading text: $(()) is not bash specific

Hello,

In the "RETURN VALUES" section of the manual page for smartctl(8), it is
stated:

       To test within the shell for whether or not the different bits
       are turned on or off, you can use the following type of
       construction (this is bash syntax):
       smartstat=$(($? & 8))
       This looks at only at bit 3 of the exit status $?  (since 8=2^3).
       The shell variable $smartstat will be nonzero if SMART status
       check returned "disk failing" and zero otherwise.

       This bash script prints all status bits:
       status=$?
       for ((i=0; i<8; i++)); do
         echo "Bit $i: $((status & 2**i && 1))"
       done

All references to bash should be removed and replaced with notes that
this is instead *POSIX* shell syntax -- this code works in all POSIX
shells. See section 2.6.4 of POSIX[0].

Perhaps this was confused with `((', which is indeed not POSIX (although
it is also not bash-specific).

Thanks.

[0]: http://pubs.opengroup.org/onlinepubs/009604599/utilities/xcu_chap02.html#tag_02_06_04

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