Remove outdated part of help message.

The styles are now documented with the -style option. This fixes
llvm.org/PR15689.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179017 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/clang-format/ClangFormat.cpp b/tools/clang-format/ClangFormat.cpp
index c4969b2..bbc4ff0 100644
--- a/tools/clang-format/ClangFormat.cpp
+++ b/tools/clang-format/ClangFormat.cpp
@@ -139,7 +139,6 @@
   cl::ParseCommandLineOptions(
       argc, argv,
       "A tool to format C/C++/Obj-C code.\n\n"
-      "Currently supports LLVM and Google style guides.\n"
       "If no arguments are specified, it formats the code from standard input\n"
       "and writes the result to the standard output.\n"
       "If <file> is given, it reformats the file. If -i is specified together\n"