doc: fix showpalette position

doc/filters.texi

@@ -6885,19 +6885,6 @@ pad="2*iw:2*ih:ow-iw:oh-ih"
 @end example
 @end itemize
 
-@section showpalette
-
-Displays the 256 colors palette of each frame. This filter is only relevant for
-@var{pal8} pixel format frames.
-
-It accepts the following option:
-
-@table @option
-@item s
-Set the size of the box used to represent one palette color entry. Default is
-@code{30} (for a @code{30x30} pixel box).
-@end table
-
 @section perspective
 
 Correct perspective of video not recorded perpendicular to the screen.
@@ -8082,6 +8069,19 @@ The Adler-32 checksum (printed in hexadecimal) of each plane of the input frame,
 expressed in the form "[@var{c0} @var{c1} @var{c2} @var{c3}]".
 @end table
 
+@section showpalette
+
+Displays the 256 colors palette of each frame. This filter is only relevant for
+@var{pal8} pixel format frames.
+
+It accepts the following option:
+
+@table @option
+@item s
+Set the size of the box used to represent one palette color entry. Default is
+@code{30} (for a @code{30x30} pixel box).
+@end table
+
 @section shuffleplanes
 
 Reorder and/or duplicate video planes.