fix comment - add whitespace

sdk/lib/developer/developer.dart

Index: sdk/lib/developer/developer.dart
diff --git a/sdk/lib/developer/developer.dart b/sdk/lib/developer/developer.dart
index c51a6803a084a946f32baa5a640e54c0f78ab80d..d5620e41d9e054529b135207d92b2589ec9c7932 100644
--- a/sdk/lib/developer/developer.dart
+++ b/sdk/lib/developer/developer.dart
@@ -37,13 +37,13 @@ external Object inspect(Object object);
 
 /// Emit a log event.
 /// [message] is the log message.
-/// [time] (optional) is the timestamp.
-/// [sequenceNumber] (optional) is a monotonically increasing sequence number.
-/// [level] (optional) is the severity level (value between 0 and 2000).
-/// [name] (optional) is the name of the source of the log message.
-/// [zone] (optional) the zone where the log was emitted
-/// [error] (optional) an error object associated with this log event.
-/// [stackTrace] (optional) a stack trace associated with this log event.
+/// [time]  (optional) is the timestamp.
+/// [sequenceNumber]  (optional) is a monotonically increasing sequence number.
+/// [level]  (optional) is the severity level (value between 0 and 2000).
+/// [name]  (optional) is the name of the source of the log message.
+/// [zone]  (optional) the zone where the log was emitted
+/// [error]  (optional) an error object associated with this log event.
+/// [stackTrace]  (optional) a stack trace associated with this log event.
 external void log(String message,
                   {DateTime time,
                    int sequenceNumber,