Merge pull request #659 from percona/edux-image-fix-1

Fix 404 image source path in threadpool documentation

Author: patrickbirch

docs/threadpool.md

@@ -83,7 +83,7 @@ Worker threads first scan the high-priority queue for queries to process. Once a
 
 The thread pool adapts to shifts in workload by redistributing queued tasks and prioritizing available threads. This dynamic management improves system responsiveness while minimizing the number of threads in use.
 
-<img src="../_static/thread-pool-diagram.png" alt="Thread pool diagram" width="250" />
+<img src="./_static/thread-pool-diagram.png" alt="Thread pool diagram" width="250" />
 
 ### Thread groups