Update troubleshooting.mdx

Author: ArturT

docusaurus/docs/ruby/troubleshooting.mdx

@@ -102,8 +102,8 @@ See the backtrace(s) showing what code line causes the hanging problem. The back
 ```text title="Tests output"
 ================================================================================
 Start logging 2 detected threads.
-Use the following backtrace(s) to find the line of code that got stuck
-if the CI node hung and terminated your tests.
+Use the following backtrace(s) to find the line of code that got stuck if the CI node hung and terminated your tests.
+How to read the backtrace: https://knapsackpro.com/perma/ruby/backtrace-debugging
 
 Main thread backtrace:
 knapsack_pro-ruby/lib/knapsack_pro/runners/queue/base_runner.rb:83:in `backtrace'