Apply suggestion to src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java

src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java

@@ -83,7 +83,7 @@ class Sequences {
    * x-values are the union of all specified sequences, and the y-values are
    * summed accordingly.
    * 
-   * @param xySequences
+   * @param xySequences to combine
    * @return xys
    */
   static XySequence combine(Collection<XySequence> xySequences) {