add comment to equals function

Author: utkarsh-goel-google

lib/src/main/java/com/google/cloud/datalineage/producerclient/CacheOptions.java

@@ -61,6 +61,10 @@ public CacheOptions.Builder toBuilder() {
     return new CacheOptions.Builder(this);
   }
 
+  /**
+   * Returns true if the other object is also a CacheOptions and has the same values for all
+   * fields.
+   */
   @Override
   public boolean equals(Object obj) {
     if (this == obj) {