$OFS is conceptually a preference variable.
It isn't automatic in the sense that PS defines it automatically. While it does have an implied default value, it is not predefined by PS as a variable.
Therefore, $OFS should be documented in about_Preference_Variables only and therefore be removed from about_Automatic_Variables.
Given that the about_Automatic_Variables description of $OFS is more detailed, it should probably replace the one in about_Preference_Variables.
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