squash: Update API_TRANSITION_GUIDE.md

Co-authored-by: Lance Ball <[email protected]>
Signed-off-by: Lucas Holmquist <[email protected]>

Author: lholmquist

API_TRANSITION_GUIDE.md

@@ -15,7 +15,7 @@ The `Receiver` class has been removed.
 
 #### Emitter
 
-The `Emitter` class has been removed.
+The `Emitter` class has been changed with the removal of `Emitter.send()` and the addition of `Emitter.emit()`. This change puts the responsibility for network transport on the developer. See the example below.
 
 `Emit.send` should be transitioned to `HTTP.binary` for binary events and `HTTP.structured` for structured events