code: public TableWriteItems addHashOnlyPrimaryKeysToDelete(String hashKeyName,
              Object ... hashKeyValues) {
          for (Object hashKeyValue: hashKeyValues) {
              this.addPrimaryKeyToDelete(new PrimaryKey(hashKeyName, hashKeyValue));
          }
          return this;
      }
docs: Adds multiple hash-only primary keys to be deleted in a batch write
  operation.
  
  @param hashKeyName name of the hash key attribute name
  @param hashKeyValues multiple hash key values
  @return the current instance for method chaining purposes