Merge #20759: doc: [test] Remove outdated comment in fuzz runner

fa511042b0 doc: [test] Remove outdated comment in fuzz runner (MarcoFalke)

Pull request description:

  All folders are soft-created with `os.makedirs`

ACKs for top commit:
  RiccardoMasutti:
    ACK fa51104

Tree-SHA512: 4051688946a205a981bbb005300fe3263495ead26591042b38ae44f4297c7689a613b560052fb5405a62054734d2599cfb0554a37c7b7369fb3a3636743d04a8

test/fuzz/test_runner.py

@@ -54,7 +54,7 @@ def main():
     )
     parser.add_argument(
         '--m_dir',
-        help='Merge inputs from this directory into the seed_dir. Needs /target subdirectory.',
+        help='Merge inputs from this directory into the seed_dir.',
     )
     parser.add_argument(
         '-g',
@@ -210,7 +210,7 @@ def generate_corpus_seeds(*, fuzz_pool, build_dir, seed_dir, targets):
 
 
 def merge_inputs(*, fuzz_pool, corpus, test_list, build_dir, merge_dir):
-    logging.info("Merge the inputs in the passed dir into the seed_dir. Passed dir {}".format(merge_dir))
+    logging.info("Merge the inputs from the passed dir into the seed_dir. Passed dir {}".format(merge_dir))
     jobs = []
     for t in test_list:
         args = [