docs: update FAQ

README.md

@@ -30,4 +30,7 @@
 
 - **Q: Why don't the `Ref` types implement `Deref` and `DerefMut`?**
 
-  **A:** [Blame `loom` for this.](https://github.com/tokio-rs/loom/pull/219)
+  **A:** [Blame `loom` for this.](https://github.com/tokio-rs/loom/pull/219)
+  
+ - **Q: Why do the channels only have `try_send`? Where's `send`? 
+   **A:** I haven't written `send` yet. :)