Fix typo in docstring

Co-authored-by: Jen Tak <[email protected]>

src/lib.rs

@@ -780,7 +780,7 @@ impl SystemHandle {
 
     /// Publish an event. All actors that have previously subscribed to the type will receive it.
     ///
-    /// The event will be cached if it implements [`CacheableEvent`]. Actors that will subscribe
+    /// The event will be cached if it implements [`CacheableEvent`]. Actors that will subscribe to
     /// such an event type in future may choose to receive the last cached event upon subscription.
     ///
     /// When sending to some subscriber fails, others are still tried and vec of errors is returned.