Summary:
Add error messages to a couple of static_asserts in span to match the
style used in the rest of the file. Also fix an extra paren typo in a
assert error message.
Committed on behalf of Jason Lovett.
Reviewers: ldionne
Subscribers: libcxx-commits
Differential Revision: https://reviews.llvm.org/D52841
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@343725 91177308-0d34-0410-b5e6-96231b3b80d8