testimage.bbclass: Correct the comment to state right dir for test cases

(From OE-Core rev: b464e338b30fe038e081e0dcae9f50c120d2f81c)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/testimage.bbclass

@@ -13,7 +13,7 @@
 
 # You can set (or append to) TEST_SUITES in local.conf to select the tests
 # which you want to run for your target.
-# The test names are the module names in meta/lib/oeqa/runtime.
+# The test names are the module names in meta/lib/oeqa/runtime/cases.
 # Each name in TEST_SUITES represents a required test for the image. (no skipping allowed)
 # Appending "auto" means that it will try to run all tests that are suitable for the image (each test decides that on it's own).
 # Note that order in TEST_SUITES is relevant: tests are run in an order such that