Fix spelling mistake in corrections file

nyalldawson · nyalldawson · commit bdd7ab6c4d8b · 2016-02-03T06:49:58.000+11:00
(...my spelling ineptitude has reached a new low)
diff --git a/scripts/spelling.dat b/scripts/spelling.dat
@@ -488,8 +488,11 @@ surpress:suppress
 artefact:artifact
 artefacts:artifacts
 metres:meters
+millimetre:millimeter
 millimetres:millimeters
-centimetres:centimers
+centimetre:centimeter
+centimetres:centimeters
+kilometre:kilometer
 kilometres:kilometers
 unselect:deselect
 
