spelling: distinguish

Author: jsoref

docs/olc_definition.adoc

@@ -279,7 +279,7 @@ two key functions:
 - It allows us to recognise shortened code fragments such as MQPX+9G. Because
 we know that the "+" is after the eighth digit, we know that there are four
 digits to be recovered for this code.
-- It allows us to distinguise four or six digit codes from postal codes.
+- It allows us to distinguish four or six digit codes from postal codes.
 
 But this means that we have a problem if we want to represent the 1x1 degree
 area 6GCR. The solution here is to use zero, as a padding symbol, giving us