docs: add a missing panic scenario of time::advance (#7394)

Author: ADD-SP

tokio/src/time/clock.rs

@@ -185,8 +185,18 @@ cfg_test_util! {
     ///
     /// # Panics
     ///
-    /// Panics if time is not frozen or if called from outside of the Tokio
-    /// runtime.
+    /// Panics if any of the following conditions are met:
+    ///
+    /// - The clock is not frozen, which means that you must
+    ///   call [`pause`] before calling this method.
+    /// - If called outside of the Tokio runtime.
+    /// - If the input `duration` is too large (such as [`Duration::MAX`])
+    ///   to be safely added to the current time without causing an overflow.
+    ///
+    /// # Caveats
+    ///
+    /// Using a very large `duration` is not recommended,
+    /// as it may cause panicking due to overflow.
     ///
     /// # Auto-advance
     ///