Modify the body content of a note

gv_modify_notes_email_content.php

<?php

add_action( 'plugins_loaded', function() {
	add_filter( 'gravityview/field/notes/email_content', 'gv_modify_notes_email_content', 10, 4 );
}, 20 );

/**
 * Modify the email content
 * 
 * @param array $email_settings
 * 
 * @return array $email_settings Modified array, with message wrapped in <h2>
 */
function gv_modify_notes_email_content( $email_settings ) {
    
	$email_settings['message'] = '<h2>' . $email_settings['message'] . '</h2>';

	return $email_settings;
}