Add back ticks to comment (#13)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Documentation**
- Enhanced clarity of the `getDeadline` method documentation in the
`Event` class by improving the description of the `deadline` variable.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

include/olga_scheduler/olga_scheduler.hpp

@@ -93,7 +93,7 @@ class Event : private cavl::Node<Event<TimePoint>>
     }
 
     /// Diagnostic accessor for testing. Not intended for normal use.
-    /// The deadline is TimePoint::min() if the event is not scheduled or canceled.
+    /// The deadline is `TimePoint::min()` if the event is not scheduled or canceled.
     /// It is guaranteed that while an event resides in the tree, it has a valid deadline set.
     [[nodiscard]] TimePoint getDeadline() const noexcept { return deadline_; }