doc/filters: fix inaccuarte/inaccurate typo

doc/filters.texi

@@ -6124,7 +6124,7 @@ full weight of 1.0 forever.
 When this is not 0 then idet will use the specified number of frames to determine
 if the interlaced flag is accurate, it will not count undetermined frames.
 If the flag is found to be accurate it will be used without any further
-computations, if it is found to be inaccuarte it will be cleared without any
+computations, if it is found to be inaccurate it will be cleared without any
 further computations. This allows inserting the idet filter as a low computational
 method to clean up the interlaced flag
 @end table