Documentation cleanup: escape \ characters in Doxygen comments as needed.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158968 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/TextDiagnostic.cpp b/lib/Frontend/TextDiagnostic.cpp
index 5c8da05..d0c3626 100644
--- a/lib/Frontend/TextDiagnostic.cpp
+++ b/lib/Frontend/TextDiagnostic.cpp
@@ -179,7 +179,7 @@
 ///
 ///    "a \t \u3042" -> {0,1,2,8,9,-1,-1,11}
 ///
-///  (\u3042 is represented in UTF-8 by three bytes and takes two columns to
+///  (\\u3042 is represented in UTF-8 by three bytes and takes two columns to
 ///   display)
 static void byteToColumn(StringRef SourceLine, unsigned TabStop,
                          SmallVectorImpl<int> &out) {
@@ -213,7 +213,7 @@
 ///
 ///    "a \t \u3042" -> {0,1,2,-1,-1,-1,-1,-1,3,4,-1,7}
 ///
-///  (\u3042 is represented in UTF-8 by three bytes and takes two columns to
+///  (\\u3042 is represented in UTF-8 by three bytes and takes two columns to
 ///   display)
 static void columnToByte(StringRef SourceLine, unsigned TabStop,
                          SmallVectorImpl<int> &out) {