doc: fix the index order in pseudocode of modules

fix the index order in pseudocode of modules.

PR-URL: #9562
Reviewed-By: Shigeki Ohtsu <ohtsu@ohtsu.org>
Reviewed-By: Yosuke Furukawa <yosuke.furukawa@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>

doc/api/modules.md

@@ -181,9 +181,9 @@ NODE_MODULES_PATHS(START)
 3. let DIRS = []
 4. while I >= 0,
    a. if PARTS[I] = "node_modules" CONTINUE
-   c. DIR = path join(PARTS[0 .. I] + "node_modules")
-   b. DIRS = DIRS + DIR
-   c. let I = I - 1
+   b. DIR = path join(PARTS[0 .. I] + "node_modules")
+   c. DIRS = DIRS + DIR
+   d. let I = I - 1
 5. return DIRS
 ```