test-lib: fix typo in comment

Point test writers to the test_expect_* functions properly.

Signed-off-by: Torstein Hegge <hegge@resisty.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 1aa27bd..c5e914a 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -325,7 +325,7 @@
 . "$TEST_DIRECTORY/test-lib-functions.sh"
 
 # You are not expected to call test_ok_ and test_failure_ directly, use
-# the text_expect_* functions instead.
+# the test_expect_* functions instead.
 
 test_ok_ () {
 	test_success=$(($test_success + 1))