Update getting-started.md

merge the warn and explain for the @jsx

docs/getting-started.md

@@ -57,7 +57,11 @@ React.renderComponent(
   document.getElementById('example')
 );
 ```
-> ```/** @jsx React.DOM */``` is must, or jsx would not convert.
+
+> Note:
+>
+> ```/** @jsx React.DOM */``` is *must*, which is jsx convention. The comment parser is very strict right now; in order for it to pick up the `@jsx` modifier, two conditions are required. The `@jsx` comment block must be the first comment on the file. The comment must start with `/**` (`/*` and `//` will not work). If the parser can't find the `@jsx` comment, it will output the file without transforming it.
+
 
 Then reference it from `helloworld.html`:
 
@@ -90,9 +94,6 @@ React.renderComponent(
 );
 ```
 
-> Note:
->
-> The comment parser is very strict right now; in order for it to pick up the `@jsx` modifier, two conditions are required. The `@jsx` comment block must be the first comment on the file. The comment must start with `/**` (`/*` and `//` will not work). If the parser can't find the `@jsx` comment, it will output the file without transforming it.
 
 Update your HTML file as below: