Update instrumentation/jmx-metrics/library/tomcat.md

Co-authored-by: SylvainJuge <[email protected]>

Author: robsunday

instrumentation/jmx-metrics/library/tomcat.md

@@ -11,6 +11,6 @@ Here is the list of metrics based on MBeans exposed by Tomcat.
 | tomcat.request.duration.max | Gauge         | tomcat.request_processor.name                       | The longest request processing time.       |
 | tomcat.request.duration.sum | Counter       | tomcat.request_processor.name                       | Total time of processing all requests.     |
 | tomcat.network.io           | Counter       | tomcat.request_processor.name, network.io.direction | The number of bytes transmitted.           |
-| tomcat.thread.count         | UpDownCounter | tomcat.thread_pool.name                             | Total thread count of the thread pool.     |
-| tomcat.thread.max           | UpDownCounter | tomcat.thread_pool.name                             | Maximum thread count of the thread pool.   |
-| tomcat.thread.busy.count    | UpDownCounter | tomcat.thread_pool.name                             | Number of busy threads in the thread pool. |
+| tomcat.thread.count         | UpDownCounter | tomcat.thread.pool.name                             | Total thread count of the thread pool.     |
+| tomcat.thread.max           | UpDownCounter | tomcat.thread.pool.name                             | Maximum thread count of the thread pool.   |
+| tomcat.thread.busy.count    | UpDownCounter | tomcat.thread.pool.name                             | Number of busy threads in the thread pool. |