Change Javadoc.

JAVA-5842

Author: vbabanin

bson/src/main/org/bson/io/ByteBufferBsonInput.java

@@ -218,7 +218,7 @@ private int computeCStringLength(final int prevPos) {
 
                result:
                00000000 00000000 10000000 00000000 00000000 00000000 00000000 00000000
-                                           ^^^^^^^^
+                                 ^^^^^^^^
                           The high bit is set only at the 0x00 byte position.
              */
             mask &= 0x8080808080808080L;