DETAILS file correction

[Werner Koch]

On Wed,  4 Mar 2015 15:44, nicholas.cole at gmail.com said:

> In a couple of places the DETAILS file of recent versions of the 1.4
> and 2.1 series refers to 'sbb' records.  I think it means 'ssb'.  A

Changed in master all to ssb (aka J3E modulation).

Thanks,

  Werner

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