code: public Update withExpressionAttributeNames(java.util.Map<String, String> expressionAttributeNames) {
          setExpressionAttributeNames(expressionAttributeNames);
          return this;
      }
docs: <p>
  One or more substitution tokens for attribute names in an expression.
  </p>
  
  @param expressionAttributeNames
  One or more substitution tokens for attribute names in an expression.
  @return Returns a reference to this object so that method calls can be chained together.