Change Comment Form in Genesis 2.0

function.php

<?php
// Do not copy the above php tag in your function.php
/**
 * Change Comment Form
 *
 * This function will modify the comment form in genesis 2.0
 * Add this to your function.php
 *
 * @author  MetaBlogue
 * @license GPL-2.0+
 * @link    https://metablogue.com/modify-comment-form-genesis-themes/ 
 */
//** Customise Comment Form
function mb_custom_comment_form ($fields) {
	$fields['comment_notes_before'] = '<p class="comment-notes">Please read our <a href="http://comment=policy-url" title="comment-policy-title">comment policy</a> before submitting your comment. Your email address will not be used or publish anywhere. You will only receive comment notifications if you opt to subscribe below. </p>';
	$fields['title_reply'] = __( 'Join The Discussion:', 'mbcustom' );   //Changes The Form Headline
	$fields['label_submit'] = __( 'Start Discussion', 'mbcustom' );      //Changes The Submit Button Text
	$fields['comment_field'] = '<p class="comment-form-comment"><label for="comment">' . _x( 'Comment', 'noun' ) . '</label><textarea id="comment" name="comment" cols="45" rows="8" placeholder="If you just want to appreciate the content, use social media share buttons. Use this section for any questions or valuable suggestions." aria-required="true"></textarea></p>';
    return $fields;
}
add_filter( 'comment_form_defaults', 'mb_custom_comment_form' );

//Customize the form default fields - author, email and URL
function mb_custom_comment_form_defaults ($fields) {
    $fields['author'] = '<p class="comment-form-author">' . '<label for="author">' . __( 'Name' ) . ( $req ? ' <span class="required">*</span>' : '' ) . '</label> ' .
                '<input id="author" name="author" type="text" placeholder="Real Name, No Keyword Spamming" value="' . esc_attr( $commenter['comment_author'] ) . '" size="30" maxlength="245"' . $aria_req . $html_req . ' /></p>';
    $fields['email'] = '<p class="comment-form-email"><label for="email">' . __( 'Email' ) . ( $req ? ' <span class="required">*</span>' : '' ) . '</label> ' .
                '<input id="email" name="email" ' . ( $html5 ? 'type="email"' : 'type="text" placeholder="Preferably Gravatar Enabled"' ) . ' value="' . esc_attr(  $commenter['comment_author_email'] ) . '" size="30" maxlength="100" aria-describedby="email-notes"' . $aria_req . $html_req  . ' /></p>';
    $fields['url'] = '<p class="comment-form-url"><label for="url">' . __( 'Website' ) . '</label> ' .
                '<input id="url" name="url" ' . ( $html5 ? 'type="url"' : 'type="text"' ) . ' placeholder="Your Own Domain Address" value="' . esc_attr( $commenter['comment_author_url'] ) . '" size="30" maxlength="200" /></p>';
    return $fields;
}
add_filter( 'comment_form_default_fields', 'mb_custom_comment_form_defaults' );

// Modify comments title text in comments
add_filter( 'genesis_title_comments', 'mb_genesis_title_comments' );
function mb_genesis_title_comments() {
    $title = '<h3>Discussion</h3>';
    return $title;
}

//Remove dates from published comment
add_filter( 'genesis_show_comment_date', '__return_false' );