fix a bunch of comment typos found by codespell.  Patch by
Luis Felipe Strano Moraes!

llvm-svn: 129559
diff --git a/clang/lib/Driver/ToolChains.h b/clang/lib/Driver/ToolChains.h
index 9c567b6..6265f3d7 100644
--- a/clang/lib/Driver/ToolChains.h
+++ b/clang/lib/Driver/ToolChains.h
@@ -57,10 +57,10 @@
   // the argument translation business.
   mutable bool TargetInitialized;
 
-  /// Whether we are targetting iPhoneOS target.
+  /// Whether we are targeting iPhoneOS target.
   mutable bool TargetIsIPhoneOS;
 
-  /// The OS version we are targetting.
+  /// The OS version we are targeting.
   mutable unsigned TargetVersion[3];
 
   /// The default macosx-version-min of this tool chain; empty until