code: func (c *Client) UpdateDictionaryItem(i *UpdateDictionaryItemInput) (*DictionaryItem, error) {
  	if i.Service == "" {
  		return nil, ErrMissingService
  	}
  
  	if i.Dictionary == "" {
  		return nil, ErrMissingDictionary
  	}
  
  	if i.ItemKey == "" {
  		return nil, ErrMissingItemKey
  	}
  
  	path := fmt.Sprintf("/service/%s/dictionary/%s/item/%s", i.Service, i.Dictionary, i.ItemKey)
  	resp, err := c.PutForm(path, i, nil)
  	if err != nil {
  		return nil, err
  	}
  
  	var b *DictionaryItem
  	if err := decodeJSON(&b, resp.Body); err != nil {
  		return nil, err
  	}
  	return b, nil
  }
docs: // UpdateDictionaryItem updates a specific dictionary item.