Update troubleshooting.adoc

Fixed discussion link to open at start of post.

src/docs/asciidoc/sdk/troubleshooting.adoc

@@ -116,7 +116,7 @@ If you're behind a proxy or special network settings, try :
 4. setup “manual proxy settings” (for some reason the “Use System Proxy Settings” option doesn't work on some Linux distributions)
 ....
 
-link:https://hub.jmonkeyengine.org/t/jme-sdk-stalls-on-startup/30555/20[Discussion] of the problem.
+link:https://hub.jmonkeyengine.org/t/jme-sdk-stalls-on-startup/30555[Discussion] of the problem.
 
 
 === Known Issues