Correct escape type for HTML attribute example

[ChrisDBrown]

From the Twig documentation the different html escapes are (emphasis mine):

• html: escapes a string for the HTML body context, or for HTML attributes values inside quotes.
• html_attr: escapes a string when used as an HTML attribute name, and also when used as the value of an HTML attribute without quotes (e.g. data-attribute={{ some_value }}).

The example code here is inside quotes:

<div data-user-profile="{{ app.user ? app.user.profileData|json_encode|e('html') }}">
    <!-- ... -->
</div>

so it seems better to recommend html as the escape strategy. It'd perhaps be better still to highlight this difference in the Symfony docs?