Add to functions.php

function jma_child_scripts()
{
    wp_add_inline_script('fontawesome', 'window.FontAwesomeConfig={searchPseudoElements:true}', 'before');
}
add_action('wp_enqueue_scripts', 'jma_child_scripts');

The Css:

/* get rid of the bullets */
#content ul li {
    list-style-type: none;
}
/* suppress the default fontawesome behavior */
#content ul li::before {
    display: none;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    -webkit-font-smoothing: antialiased;
}
/* add your icon (right-angle here) */
#content ul li::before {
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    content: '\f105';
}
/* fontawesome hijacks the before pseudo element so we have to position w/ the class that they add */
#content ul li .svg-inline--fa {
    margin: 0 5px 0 -20px;
}