DIBuilder.h: Fix a typo. [-Wdocumentation]
DIBuilder.h: Fix a typo. [-Wdocumentation]

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@293876 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 69ad39a4a1aad4b5a8d44ffb20455143924eb3b3)

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm