task: inline the docs of TaskTracker while re-exporting it (#7516)

Signed-off-by: ADD-SP <[email protected]>

tokio-util/src/task/mod.rs

@@ -8,6 +8,7 @@ cfg_rt! {
     pub use spawn_pinned::LocalPoolHandle;
 
     pub mod task_tracker;
+    #[doc(inline)]
     pub use task_tracker::TaskTracker;
 
     mod abort_on_drop;