Some of these headings had the incorrect number of "underlines" and so would get warnings when generating the content from Sphinx. No functional changes intended.
Some of these headings had the incorrect number of "underlines" and so would get warnings when generating the content from Sphinx. No functional changes intended.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@201713 91177308-0d34-0410-b5e6-96231b3b80d8

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