Fixing docs

public/java/src/org/broadinstitute/sting/gatk/walkers/annotator/QualByDepth.java

@@ -21,7 +21,7 @@ import java.util.List;
 import java.util.Map;
 
 /**
- * Variant confidence (given as (AB+BB)/AA from the PLs) / unfiltered depth.
+ * Variant confidence (from the QUAL field) / unfiltered depth.
  *
  * Low scores are indicative of false positive calls and artifacts.  Note that QualByDepth requires sequencing
  * reads associated with the samples with polymorphic genotypes.
@@ -101,4 +101,4 @@ public class QualByDepth extends InfoFieldAnnotation implements StandardAnnotati
         return map;
     }
 
-}
+}