Fixed incorrect documentation in test.py

The argparse documented an outdated format, and was off by 1.

Found by sender6

lfs.c

@@ -3616,16 +3616,16 @@ static int lfs_rawformat(lfs_t *lfs, const struct lfs_config *cfg) {
             goto cleanup;
         }
 
-        // force compaction to prevent accidentally mounting any
-        // older version of littlefs that may live on disk
-        root.erased = false;
-        err = lfs_dir_commit(lfs, &root, NULL, 0);
+        // sanity check that fetch works
+        err = lfs_dir_fetch(lfs, &root, (const lfs_block_t[2]){0, 1});
         if (err) {
             goto cleanup;
         }
 
-        // sanity check that fetch works
-        err = lfs_dir_fetch(lfs, &root, (const lfs_block_t[2]){0, 1});
+        // force compaction to prevent accidentally mounting any
+        // older version of littlefs that may live on disk
+        root.erased = false;
+        err = lfs_dir_commit(lfs, &root, NULL, 0);
         if (err) {
             goto cleanup;
         }

scripts/test.py

@@ -746,9 +746,9 @@ if __name__ == "__main__":
     parser.add_argument('testpaths', nargs='*', default=[TESTDIR],
         help="Description of test(s) to run. By default, this is all tests \
             found in the \"{0}\" directory. Here, you can specify a different \
-            directory of tests, a specific file, a suite by name, and even a \
-            specific test case by adding brackets. For example \
-            \"test_dirs[0]\" or \"{0}/test_dirs.toml[0]\".".format(TESTDIR))
+            directory of tests, a specific file, a suite by name, and even \
+            specific test cases and permutations. For example \
+            \"test_dirs#1\" or \"{0}/test_dirs.toml#1#1\".".format(TESTDIR))
     parser.add_argument('-D', action='append', default=[],
         help="Overriding parameter definitions.")
     parser.add_argument('-v', '--verbose', action='store_true',