doc/articles/wiki: remove generated final-test.go after test

Change-Id: If6dc3acdc023ac78f63e257974cd2d2e9f1cca10
Reviewed-on: https://go-review.googlesource.com/11161Reviewed-by: Andrew Gerrand <adg@golang.org>

doc/articles/wiki/test.bash

@@ -13,7 +13,7 @@ fi
 wiki_pid=
 cleanup() {
 	kill $wiki_pid
-	rm -f test_*.out Test.txt final-test.bin final-test-port.txt a.out get.bin
+	rm -f test_*.out Test.txt final-test.go final-test.bin final-test-port.txt a.out get.bin
 }
 trap cleanup 0 INT