fix link to coder_type

Author: dericed

ffv1.md

@@ -261,7 +261,7 @@ Note, this prediction template is also used in [@ISO.14495-1.1999] and [@HuffYUV
 
 ### Exception
 
-If `colorspace_type == 0 && bits_per_raw_sample == 16 && ( coder_type == 1 || coder_type == 2 )` (see (#colorspace-type), (#bits-per-raw-sample) and (#colorspace-type)), the following median predictor MUST be used:
+If `colorspace_type == 0 && bits_per_raw_sample == 16 && ( coder_type == 1 || coder_type == 2 )` (see (#colorspace-type), (#bits-per-raw-sample) and (#coder-type)), the following median predictor MUST be used:
 
 ```
 median(left16s, top16s, left16s + top16s - diag16s)