[forth/en] Fix expected result for one-to-12 loop (#4049)

forth.html.markdown

@@ -106,7 +106,7 @@ myloop
 
 \ We can get the value of the index as we loop with `i`:
 : one-to-12 ( -- ) 12 0 do i . loop ;     \ ok
-one-to-12                                 \ 0 1 2 3 4 5 6 7 8 9 10 11 12 ok
+one-to-12                                 \ 0 1 2 3 4 5 6 7 8 9 10 11 ok
 
 \ `?do` works similarly, except it will skip the loop if the end and start
 \ numbers are equal.