Slight update to grammar. Can probably be improved more

include/grpcpp/impl/codegen/interceptor.h

@@ -114,16 +114,16 @@ class InterceptorBatchMethods {
   /// but not both at the same time.
   /// gRPC performs serialization in a lazy manner, which means
   /// that a call to GetSerializedSendMessage will result in a serialization
-  /// operation if the payload stored is not in the serialized form already. The
+  /// operation if the payload stored is not in the serialized form already; the
-  /// non-serialized form is lost and GetSendMessage will no longer return a
+  /// non-serialized form will be lost and GetSendMessage will no longer return
-  /// valid pointer, and this will remain true for later interceptors too. This
+  /// a valid pointer, and this will remain true for later interceptors too.
-  /// can change however if ModifySendMessage is used to replace the current
+  /// This can change however if ModifySendMessage is used to replace the
-  /// payload. Note that ModifySendMessage requires a new payload message in the
+  /// current payload. Note that ModifySendMessage requires a new payload
-  /// non-serialized form. This will overwrite the existing payload irrespective
+  /// message in the non-serialized form. This will overwrite the existing
-  /// of whether it had been serialized earlier. Also note that gRPC Async API
+  /// payload irrespective of whether it had been serialized earlier. Also note
-  /// requires early serialization of the payload which means that the payload
+  /// that gRPC Async API requires early serialization of the payload which
-  /// would be available in the serialized form only unless an interceptor
+  /// means that the payload would be available in the serialized form only
-  /// replaces the payload with ModifySendMessage.
+  /// unless an interceptor replaces the payload with ModifySendMessage.
 
   /// Returns a modifable ByteBuffer holding the serialized form of the message
   /// that is going to be sent. Valid for PRE_SEND_MESSAGE interceptions.