Sentenc-ify comment added in r174206.

Based on post-commit review by Paul Robinson.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174248 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp
index 119b90a..50e52c6 100644
--- a/lib/CodeGen/CodeGenFunction.cpp
+++ b/lib/CodeGen/CodeGenFunction.cpp
@@ -144,8 +144,8 @@
     if (BI && BI->isUnconditional() &&
         BI->getSuccessor(0) == ReturnBlock.getBlock()) {
       // Reset insertion point, including debug location, and delete the branch.
-      // this is really subtle & only works because the next change in location
-      // will hit the caching in CGDebugInfo::EmitLocation & not override this
+      // This is really subtle & only works because the next change in location
+      // will hit the caching in CGDebugInfo::EmitLocation & not override this.
       Builder.SetCurrentDebugLocation(BI->getDebugLoc());
       Builder.SetInsertPoint(BI->getParent());
       BI->eraseFromParent();