Update TODO placeholders with actual links: Troubleshooting your solution

[Blind4Basics]

WARNING

those links are from the first version of the troubleshooting page (before splitting)

244: to create: [code formatting TODO](https://github.com/Codewars/Codewars.com/wiki/Markdown-Formatting) 
250: to create: [this Codewars wiki page TODO](https://github.com/Codewars/Codewars.com/wiki/Kata-Discourse)
260: Zulip? [general TODO](https://gitter.im/Codewars/Codewars.com) 
       Zulip? [kata solving help TODO](https://gitter.im/Codewars/Codewars.com/kata-solving-help)

file (once merged): https://github.com/codewars/docs/blob/master/content/recipes/troubleshooting-solutions/troubleshooting-your-solution.md