Update parameter_meta

chunked-scatter.wdl

@@ -61,6 +61,7 @@ task ChunkedScatter {
         overlap: {description: "Equivalent to chunked-scatter's `-o` option.", category: "advanced"}
         minimumBasesPerFile: {description: "Equivalent to chunked-scatter's `-m` option.", category: "advanced"}
         timeMinutes: {description: "The maximum amount of time the job will run in minutes.", category: "advanced"}
+        memory: {description: "The amount of memory this job will use.", category: "advanced"}
         dockerImage: {description: "The docker image used for this task. Changing this may result in errors which the developers may choose not to address.",
                       category: "advanced"}
     }