Fix the top-of-file comment in Attr.h to say that it's about attributes, not expressions.
Fix the top-of-file comment in Attr.h to say that it's about attributes, not
expressions.



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@158285 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang