Update building-modules.md

Typo zinnad to zinniad

docs/building-modules.md

@@ -62,7 +62,7 @@ src
     code.js
 ```
 
-When you execute `zinnad src/my-module/main.js`:
+When you execute `zinniad src/my-module/main.js`:
 
 - In `main.js`, you can import any JavaScript file inside `src/my-module` directory and its
   subdirectories (e.g. `src/my-module/util`).