Fix typo and update CHANGES.txt

CHANGES.txt

@@ -3,6 +3,10 @@ Unreleased version
   * Handle reflection for message splitting.
   * make metadata fields lazy.
   * Extend visibility of plugin library to upb
+  * Take StringPiece instead of const string& in absl stubs.
+  * Modernize conformance_cpp.cc.
+  * Don't request 64-byte alignment unless the toolchain supports it.
+
 
 2022-05-27 version 21.1 (C++/Java/Python/PHP/Objective-C/C#/Ruby)
   

conformance/conformance_cpp.cc

@@ -270,6 +270,6 @@ int main() {
     }
     total_runs++;
   }
-  GOOGLE_LOG(INFO) << "conformance-cpp: recieved EOF from test runner after "
+  GOOGLE_LOG(INFO) << "conformance-cpp: received EOF from test runner after "
             << total_runs << " tests";
 }