Fixes typo on Citra forum link.

An extra ".citra-emu.org," was left when the link was changed to the current forum URL, so I fixed that.

CONTRIBUTING.md

 # Reporting Issues
 
-**The issue tracker is not a support forum.** Unless you can provide precise *technical information* regarding an issue, you *should not post in it*. If you need support, first read the [FAQ](https://github.com/citra-emu/citra/wiki/FAQ) and then either visit our IRC channel, [our forum](https://community.citra-emu.org)
-.citra-emu.org/) or ask in a general emulation forum such as [/r/emulation](https://www.reddit.com/r/emulation/). If you post support questions, generic messages to the developers or vague reports without technical details, they will be closed and locked.
+**The issue tracker is not a support forum.** Unless you can provide precise *technical information* regarding an issue, you *should not post in it*. If you need support, first read the [FAQ](https://github.com/citra-emu/citra/wiki/FAQ) and then either visit our IRC channel, [our forum](https://community.citra-emu.org) or ask in a general emulation forum such as [/r/emulation](https://www.reddit.com/r/emulation/). If you post support questions, generic messages to the developers or vague reports without technical details, they will be closed and locked.
 
 If you believe you have a valid issue report, please post text or a screenshot from the log (the console window that opens alongside Citra) and build version (hex string visible in the titlebar and zip filename), as well as your hardware and software information if applicable.