Explicitly say that len_count and scale are temporary values.

Author: JeromeMartinez

ffv1.md

@@ -1217,7 +1217,7 @@ Inferred to be 0 if not present.
 
 ## Quantization Table Set
 
-The Quantization Table Sets are stored by storing the number of equal entries -1 of the first half of the table (represented as `len - 1` in the pseudo-code below) using the method described in [Range Non Binary Values](#range-non-binary-values). The second half doesn’t need to be stored as it is identical to the first with flipped sign.
+The Quantization Table Sets are stored by storing the number of equal entries -1 of the first half of the table (represented as `len - 1` in the pseudo-code below) using the method described in [Range Non Binary Values](#range-non-binary-values). The second half doesn’t need to be stored as it is identical to the first with flipped sign. `scale` and `len_count[ i ][ j ]` are temporary values used for the computing of `context_count[ i ]` and are not used outside Quantization Table Set pseudo-code.
 
 example: