Fix unformatted name in comment

Author: jiangzho

spark-operator/src/main/java/org/apache/spark/k8s/operator/metrics/PrometheusPullModelHandler.java

@@ -150,13 +150,14 @@ protected String formatGauge(String name, Gauge gauge) {
         && gauge.getValue() != null
         && !EMPTY_RECORD_VALUE.equals(gauge.getValue())
         && gauge.getValue() instanceof Number) {
+      String formattedName = sanitize(name);
       return "# HELP "
-          + name
+          + formattedName
           + " Gauge metric\n"
           + "# TYPE "
-          + name
+          + formattedName
           + " gauge\n"
-          + sanitize(name)
+          + sanitize(formattedName)
           + ' '
           + gauge.getValue()
           + "\n\n";