CNV GetHetCoverage: mention tool is non-bayesian version of GetBeyesianHetCoverage (#1127)

* mention tool is non-bayesian version of GetBeyesianHetCoverage

Author: sooheelee

src/main/java/org/broadinstitute/hellbender/tools/copynumber/CollectAllelicCounts.java

@@ -164,4 +164,4 @@ private void validateArguments() {
         ParamUtils.isPositiveOrZero(minimumMappingQuality, "Mapping-quality threshold must be greater than or equal to zero.");
         ParamUtils.isPositiveOrZero(minimumBaseQuality, "Base-quality threshold must be greater than or equal to zero.");
     }
-}
+}

src/main/java/org/broadinstitute/hellbender/tools/exome/GetHetCoverage.java

@@ -20,8 +20,10 @@
 import java.io.File;
 
 /**
- * Outputs reference/alternate read counts at heterozygous SNP sites present in a normal sample
- * (and at the same sites in a tumor sample, if specified).
+ * Outputs reference/alternate read counts at heterozygous SNP sites present in a normal sample,
+ * and, if specified, at the same sites in a tumor sample.
+ *
+ * <p>The non-Bayesian version of {@link GetBayesianHetCoverage}. See GetBayesianHetCoverage for modes.</p>
  *
  * @author Samuel Lee &lt;[email protected]&gt;
  */