Remove redundant word

Author: elgopher

examples/subject_test.lua

@@ -4,7 +4,7 @@
 include "subject.lua" -- include the "production" code which will be tested here
 
 -- test function starts a test with given name. Code of the test is provided
--- in the anonymous function function:
+-- in the anonymous function:
 test("compare strings", function()
 	local s = concat("hello ", "world")
 	-- change with assert_not_eq to get test error: