doc: Make all module docs self-contained

modules/gdnative/config.py

@@ -1,4 +1,3 @@
-
 def can_build(platform):
     return True
 
@@ -6,7 +5,13 @@ def configure(env):
     env.use_ptrcall = True
 
 def get_doc_classes():
-  return ["GDNative", "GDNativeLibrary", "NativeScript", "ARVRInterfaceGDNative"]
+    return [
+        "ARVRInterfaceGDNative",
+        "GDNative",
+        "GDNativeLibrary",
+        "NativeScript",
+        "PluginScript",
+    ]
 
 def get_doc_path():
-  return "doc_classes"
+    return "doc_classes"