Fix spelling of receiver and transceiver.

Bug: None
Change-Id: I439e217d67283b182833e48da15af9ae367ac14e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/256015
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36257}

rtc_base/callback_list_unittest.cc

@@ -17,7 +17,7 @@
 namespace webrtc {
 namespace {
 
-TEST(CallbackList, NoRecieverSingleMessageTest) {
+TEST(CallbackList, NoReceiverSingleMessageTest) {
   CallbackList<std::string> c;
 
   c.Send("message");