IRL: N18 / E20 exit 6

[yakra]

Similar to FRA-BFC A36 exit 14.1, the waypoint labels here don't match convention.
The western one is actually signed as plain Exit 6:
https://www.google.com/maps/@52.7052722,-8.834062,3a,29.4y,164.32h,95.18t/data=!3m9!1e1!3m7!1spxF4QIMWZK3frEWZaUXGJQ!2e0!7i16384!8i8192!9m2!1b1!2i40
https://www.google.com/maps/@52.703403,-8.8329886,3a,34.4y,170.03h,88.69t/data=!3m9!1e1!3m7!1sPblLZJ9HQt1AUjvvyFkp3w!2e0!7i16384!8i8192!9m2!1b1!2i40
Recommend:
6a_E -> 6a
6a_W -> 6b

[michih]

I think it's fixed. Marking solved.