Remove repeated words (fixes #1591)

data/core.yaml

@@ -388,7 +388,7 @@ en:
       Although addresses are often represented as parts of streets, in OpenStreetMap
       they're recorded as attributes of buildings and places along streets.
 
-      You can add address information to places mapped as building outlines as well
+      You can add address information to places mapped as building outlines
       as well as those mapped as single points. The optimal source of address
       data is from an on-the-ground survey or personal knowledge - as with any
       other feature, copying from commercial sources like Google Maps is strictly