Fixing the indentation of the RST content in the release notes. Fixes two warnings when building the HTML content and improves the format of the resulting content.
Fixing the indentation of the RST content in the release notes. Fixes two warnings when building the HTML content and improves the format of the resulting content.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@201987 91177308-0d34-0410-b5e6-96231b3b80d8

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