Fixed spelling errors surfaced by CodeSpell.

java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java

@@ -78,7 +78,7 @@ public class InvalidProtocolBufferException extends IOException {
     /* This write can be racy if the same exception is stored and then thrown by multiple custom
      * InputStreams on different threads. But since it only ever moves from false->true, there's no
      * problem. A thread checking this condition after catching this exception from a delegate
-     * stram of CodedInputStream is guaranteed to always observe true, because a write on the same
+     * stream of CodedInputStream is guaranteed to always observe true, because a write on the same
      * thread set the value when the exception left the delegate. A thread checking the same
      * condition with an exception created by CodedInputStream is guaranteed to always see false,
      * because the exception has not been exposed to any code that could publish it to other threads

src/google/protobuf/compiler/cpp/cpp_file.cc

@@ -856,8 +856,8 @@ void FileGenerator::GenerateReflectionInitializationCode(io::Printer* printer) {
       "};\n"
       // This function exists to be marked as weak.
       // It can significantly speed up compilation by breaking up LLVM's SCC in
-      // the .pb.cc tranlation units. Large translation units see a reduction of
-      // more than 35% of walltime for optimized builds.
+      // the .pb.cc translation units. Large translation units see a reduction
+      // of more than 35% of walltime for optimized builds.
       // Without the weak attribute all the messages in the file, including all
       // the vtables and everything they use become part of the same SCC through
       // a cycle like: