Format code with scalafmt and fix header issues in Op.scala

Author: QueenJcloud

core/src/main/scala/cats/data/Op.scala

@@ -17,7 +17,7 @@
  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
+*/
 
 package cats
 package data