Fix chapter 9 ToC sections

Author: masak

spec/README.md

@@ -117,12 +117,12 @@
 
 ### Chapter 9: Modules
 
-## 9.1 Modules as namespaces
-## 9.2 Import
-## 9.3 Export
-## 9.4 Aggregate module export
-## 9.5 The import binding mechanism
-## 9.6 Packages and distributions
+* 9.1 Modules as namespaces
+* 9.2 Import
+* 9.3 Export
+* 9.4 Aggregate module export
+* 9.5 The import binding mechanism
+* 9.6 Packages and distributions
 
 ### Chapter 10: Interactivity