Do not texturize the "myshortcode" contents

functions.php

<?php

/*
 *  https://codex.wordpress.org/Plugin_API/Filter_Reference/no_texturize_shortcodes
 */

add_filter( 'no_texturize_shortcodes', 'shortcodes_to_exempt_from_wptexturize' );
function shortcodes_to_exempt_from_wptexturize( $shortcodes ) {
    $shortcodes[] = 'myshortcode';
    return $shortcodes;
}