/c desc reset (or /c reset desc) does not work, neither does any combination including quote marks or undersquares.
Try /c desc set.
desc reset brings out the description that you had when you first created character. It does not empty description window.
I created the character with an empty bio. /c desc reset should restore that?
Someone else PM'ed me that it didn't work for him either, so I'm led to assume that it's not broken.
/c desc set fixes my issue though, thanks Mental. Thought I tried, but apparently..