RFR (XXS): 8202781: Fix typo in DiscoveredListIterator::complete_enqeue

[Thomas Schatzl]

Hi all,

  while doing some follow-up work after pushing JDK-8202017 I noticed
that there is a typo in the DiscoveredListIterator::complete_enqeue()
method name, missing an "u".

Can I have reviews for this trivial change?

CR:
https://bugs.openjdk.java.net/browse/JDK-8202781
Webrev:
http://cr.openjdk.java.net/~tschatzl/8202781/webrev/
Testing:
local compilation

Thanks,
  Thomas