swift234

Release notes: remove controversial discussion about NSUInteger.

...because it seems that the NSUInteger plan is itself still controversial.
(See <rdar://problem/15368372>.)

The typealiases for NSInteger and other types will be reinstated soon,
at which point the behavior will be that the importer translates an API
using NSInteger to an API using Int, but the user can still utter "NSInteger"
to get an Int.

Swift SVN r14098