minor header guards and help messages cleanup

llvm-svn: 279226
diff --git a/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
index d887b8e..e5a44fc 100644
--- a/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
+++ b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
@@ -176,7 +176,7 @@
 
 static cl::opt<std::string> ExportFixes("export-fixes", cl::desc(R"(
 YAML file to store suggested fixes in. The
-stored fixes can be applied to the input sorce
+stored fixes can be applied to the input source
 code with clang-apply-replacements.
 )"),
                                         cl::value_desc("filename"),