Comment Parsing Can Create 404 Errors

## Describe the bug
Discovered in the DnnCommunity.org website... The comments engine does a good job of attempting to automatically link domain names in the comments. Perhaps, too good. If someone happens to be speaking about `App_Offline.html` for example, it thinks that you're trying to link to a website at `App_Offlin.ht`.

## Software Versions
- DNN: 09.08.00
- Module: 06.05.00

## To Reproduce
Steps to reproduce the behavior:
1. Install DNN & Blog
2. Configure the blog to allow you to create a new post.
3. Create a new post.
4. As any user, add a comment that mentions `App_Offline.html`. Do not include any other text that could potentially be a website.

## Expected behavior
The comment is posted with no links/URLs.