Update troubleshooting.asciidoc
Fixed a broken link.
@@ -9,7 +9,7 @@ Something isn't quite working as expected?
Here are some guidelines how to find out what's going wrong.
Don't worry if you can't figure out what the problem is.
-Open a topic in the https://discuss.elastic.co/c/apm:[APM discuss forum]
+Open a topic in the https://discuss.elastic.co/c/apm[APM discuss forum]
and we will help you out.
If you do so, please attach your debug logs so that we can analyze the problem.
