doc: include node.module_timer on available categories

PR-URL: #53638
Reviewed-By: Yagiz Nizipli <yagiz.nizipli@sentry.io>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: H4ad

doc/api/tracing.md

@@ -46,6 +46,7 @@ The available categories are:
   `runInNewContext()`, `runInContext()`, and `runInThisContext()` methods.
 * `v8`: The [V8][] events are GC, compiling, and execution related.
 * `node.http`: Enables capture of trace data for http request / response.
+* `node.module_timer`: Enables capture of trace data for CJS Module loading.
 
 By default the `node`, `node.async_hooks`, and `v8` categories are enabled.