doc/filters: move reference to framesync options from lut3d to haldclut

Signed-off-by: Marton Balint <cus@passwd.hu>

doc/filters.texi

@@ -10844,6 +10844,8 @@ Default is @code{1}.
 @code{haldclut} also has the same interpolation options as @ref{lut3d} (both
 filters share the same internals).
 
+This filter also supports the @ref{framesync} options.
+
 More information about the Hald CLUT can be found on Eskil Steenberg's website
 (Hald CLUT author) at @url{http://www.quelsolaar.com/technology/clut.html}.
 
@@ -11929,8 +11931,6 @@ Interpolate values using a tetrahedron.
 @end table
 @end table
 
-This filter also supports the @ref{framesync} options.
-
 @section lumakey
 
 Turn certain luma values into transparency.