Fix typo in TryMakeSender comment

Change-Id: I88672e357856ead04c57dc4f8b2cf38ea9016465
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/aos/events/event_loop.h b/aos/events/event_loop.h
index ac2da4c..c81fa1e 100644
--- a/aos/events/event_loop.h
+++ b/aos/events/event_loop.h
@@ -593,7 +593,7 @@
   }
 
   // Like MakeSender, but returns an invalid sender if the given channel is
-  // not readable on this node or does not exist.
+  // not sendable on this node or does not exist.
   template <typename T>
   Sender<T> TryMakeSender(const std::string_view channel_name) {
     const Channel *channel = GetChannel<T>(channel_name);