7199500: Minor typo in AbstractStringBuilder.java header

Reviewed-by: coffeys
diff --git a/jdk/src/share/classes/java/lang/AbstractStringBuilder.java b/jdk/src/share/classes/java/lang/AbstractStringBuilder.java
index 8d91bb5..94585f8 100644
--- a/jdk/src/share/classes/java/lang/AbstractStringBuilder.java
+++ b/jdk/src/share/classes/java/lang/AbstractStringBuilder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.ob
+ * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it