Fix a variety of user-visible and comment typos

llvm-svn: 196038
diff --git a/clang-tools-extra/clang-modernize/Core/IncludeDirectives.h b/clang-tools-extra/clang-modernize/Core/IncludeDirectives.h
index 51627c5..d611caf 100644
--- a/clang-tools-extra/clang-modernize/Core/IncludeDirectives.h
+++ b/clang-tools-extra/clang-modernize/Core/IncludeDirectives.h
@@ -114,7 +114,7 @@
   /// NewLineFlags).
   ///
   /// Source files often contain a file header (copyright, license, explanation
-  /// of the file content). An \#include should preferrably be put after this.
+  /// of the file content). An \#include should preferably be put after this.
   std::pair<unsigned, unsigned>
   findFileHeaderEndOffset(clang::FileID FID) const;