doc/filters: remove false claim in sofalizer description

Remove false claim that processing in freq domain is
worse quality than processing in time domain.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

doc/filters.texi

@@ -3217,9 +3217,9 @@ HRTFs. Default is 1.
 
 @item type
 Set processing type. Can be @var{time} or @var{freq}. @var{time} is
-processing audio in time domain which is slow but gives high quality output.
-@var{freq} is processing audio in frequency domain which is fast but gives
-mediocre output. Default is @var{freq}.
+processing audio in time domain which is slow.
+@var{freq} is processing audio in frequency domain which is fast.
+Default is @var{freq}.
 
 @item speakers
 Set custom positions of virtual loudspeakers. Syntax for this option is: