You can override the whole method for that shortcode in your child theme if you want to change the markup.
The method is in your \shortcodes\vc\boc_side_icon_box.php and you can redeclare it in your child theme as so:

	function shortcode_boc_side_icon_box( $atts, $content = null ) {
		

		$atts = vc_map_get_attributes('boc_side_icon_box', $atts );
		extract( $atts );	

		$icon_css = $icon_bgr_css = '';
		
		$link = '';
		if($href){
			$link = '<a href="'.esc_url($href).'" target="'.esc_attr($target).'">';
		}
		
		if($has_icon_color){
			if($icon_solid) {
				$icon_bgr_css = "background: ". esc_attr($icon_color) .";";
			}else {
				$icon_css = "color: ". esc_attr($icon_color) .";";
			}
		}
					
		$content = '<div class="side_icon_box '.esc_attr($icon_size).' '.esc_attr($css_classes).' '.($animated ? "boc_animate_when_almost_visible" : "").'"><span class="icon_feat '.($icon_solid ? ' icon_solid': '').'" style="'.$icon_bgr_css.'"><i class="' . esc_attr($icon) . '" style="'.$icon_css.'"></i></span><h2>'.($href ? $link : '') . $title . ($href ? '</a>' : '').'</h2><div class="side_icon_box_content">'.do_shortcode($content).'</div></div>';
		return $content;
	}
	
	add_shortcode('boc_side_icon_box', 'shortcode_boc_side_icon_box');