[AVR] Convert C style comments to C++

llvm-svn: 269895
diff --git a/llvm/lib/Target/AVR/AVR.h b/llvm/lib/Target/AVR/AVR.h
index 4c1667e..041c77c 100644
--- a/llvm/lib/Target/AVR/AVR.h
+++ b/llvm/lib/Target/AVR/AVR.h
@@ -30,9 +30,7 @@
 FunctionPass *createAVRDynAllocaSRPass();
 FunctionPass *createAVRBranchSelectionPass();
 
-/**
- * Contains the AVR backend.
- */
+/// Contains the AVR backend.
 namespace AVR {
 
 enum AddressSpace { DataMemory, ProgramMemory };