Improve pass documentation and comments.

Patch by Matthijs Kooijman!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50861 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp
index 87c9374b..bc19114 100644
--- a/lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/lib/Transforms/Scalar/CodeGenPrepare.cpp
@@ -8,8 +8,8 @@
 //===----------------------------------------------------------------------===//
 //
 // This pass munges the code in the input function to better prepare it for
-// SelectionDAG-based code generation.  This works around limitations in it's
-// basic-block-at-a-time approach.  It should eventually be removed.
+// SelectionDAG-based code generation. This works around limitations in it's
+// basic-block-at-a-time approach. It should eventually be removed.
 //
 //===----------------------------------------------------------------------===//