Remove doctype declaration from the example index.html, as it seems to muck up Firefox
diff --git a/WebAssembly.md b/WebAssembly.md
index abeac21..58cdc13 100644
--- a/WebAssembly.md
+++ b/WebAssembly.md
@@ -39,7 +39,6 @@
 Create an `index.html` file:
 
 ```HTML
-<!doctype html>
 <html>
 	<head>
 		<meta charset="utf-8">