libunwind: correct 'libuwind' typo

There were several instances of libuwind (missing an "n"), dating to
the initial import of libunwind.

llvm-svn: 280086
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: e8a15cef9ddcca4412a814a1c6d3a81656714650
diff --git a/src/UnwindCursor.hpp b/src/UnwindCursor.hpp
index 18a7809..806df31 100644
--- a/src/UnwindCursor.hpp
+++ b/src/UnwindCursor.hpp
@@ -6,7 +6,7 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //
-// C++ interface to lower levels of libuwind
+// C++ interface to lower levels of libunwind
 //===----------------------------------------------------------------------===//
 
 #ifndef __UNWINDCURSOR_HPP__