message: updated RasterCreationOption example
diff: ## Unreleased
  -- Add support to define creation options for raster datasets. To support this a new struct to store a creation option key and value pair (`RasterCreationOption`) and and function (`driver.create_with_band_type_with_options()`) were created.
  +- Add support for raster dataset creation options. A new struct (`RasterCreationOption`) and function (`driver.create_with_band_type_with_options()`) are now available for this.
  ```rust
  let driver = Driver::get("GTiff").unwrap();
  - let options = vec![RasterCreationOption{key:"COMPRESS", value:"LZW"} ,
  + let options = [RasterCreationOption{key:"COMPRESS", value:"LZW"} ,
  RasterCreationOption{key:"TILED", value: "YES"}] ;
  let mut dataset = driver
  - .create_with_band_type_with_options::<u8>("testing.tif",
  - 2048,
  - 2048,
  - 1,
  - options)
  + .create_with_band_type_with_options::<u8>("testing.tif",2048,2048,1,&options)
  .unwrap();
  ```
  