Change post editor title text

add_filter( 'enter_title_here', 'wpb_change_title_text' );

function wpb_change_title_text( $title ){
     global $typenow;
     if( $typenow == 'post-type' ) {
          $title = 'Enter new title';
     }
     if( $typenow == '2nd-post-type' ) {
          $title = 'Enter new title';
     }
     return $title;
}