Fix [TOC] tag.

Steps to reproduce:

1. Wiki -> Edit Home
2. Ensure that syntax is markdown is selected.
3. Post the following tag:

[TOC]

1. Click Save

Expected result: TOC with links to other pages.

Actual result: empty page content.

Please fix the TOC, without marking of this issue as duplicate, because the [TOC] tag still not working for the Home page and the markdown syntax.