RFR: JDK-8173664: Typo in https://java.net/downloads/heap-snapshot/hprof-binary-format.html

[Fairoz Matte]

Hi,

Kindly review the small typo fix, applicable only for JDK8
BugID: https://bugs.openjdk.java.net/browse/JDK-8173664
Webrev: http://cr.openjdk.java.net/~rpatil/8173664/webrev/ 

Thanks,
Fairoz