Fix Content.md example: resolve variable ordering and method signature issues

[Copilot]

The Content.md example file contained Java code with compilation errors that would prevent users from successfully using the provided example.

Issues fixed:

1. Variable scope error: The types variable was being referenced in the ContentCreateRequest constructor before it was declared, causing a "Cannot resolve symbol 'types'" compilation error.

2. Invalid method signature: The main method was missing the required String[] args parameter.

Before:

public static void main {  // Missing String[] args
    // ...
}

public static void createTwilioText() {
    Content.ContentCreateRequest createRequest = new Content.ContentCreateRequest("es", types); // types not yet declared
    
    Content.TwilioText twilioText = new Content.TwilioText();
    twilioText.setBody("text body");

    Content.Types types = new Content.Types(); // declared after use
    types.setTwilioText(twilioText);
    // ...
}

After:

public static void main(String[] args) {  // Fixed method signature
    // ...
}

public static void createTwilioText() {
    Content.TwilioText twilioText = new Content.TwilioText();
    twilioText.setBody("text body");

    Content.Types types = new Content.Types(); // declared before use
    types.setTwilioText(twilioText);
    
    Content.ContentCreateRequest createRequest = new Content.ContentCreateRequest("es", types); // types now available
    // ...
}

The corrected code now follows proper Java variable scoping rules and compiles without errors, allowing users to successfully use the Content API example.

Fixes #889.

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