Doxygenize the documentation comments

src/IceRNG.h

Index: src/IceRNG.h
diff --git a/src/IceRNG.h b/src/IceRNG.h
index 83001ad2ee5b9a25bb081cf71ef6650a2d62c330..5ddd97f247fedfa551f01bf78cbb4b27e9635244 100644
--- a/src/IceRNG.h
+++ b/src/IceRNG.h
@@ -6,9 +6,10 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-//
-// This file declares a random number generator.
-//
+///
+/// \file
+/// This file declares a random number generator.
+///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICERNG_H
@@ -33,9 +34,9 @@ private:
   uint64_t State;
 };
 
-// This class adds additional random number generator utilities. The
-// reason for the wrapper class is that we want to keep the
-// RandomNumberGenerator interface identical to LLVM's.
+/// This class adds additional random number generator utilities. The
+/// reason for the wrapper class is that we want to keep the
+/// RandomNumberGenerator interface identical to LLVM's.
 class RandomNumberGeneratorWrapper {
   RandomNumberGeneratorWrapper() = delete;
   RandomNumberGeneratorWrapper(const RandomNumberGeneratorWrapper &) = delete;
@@ -52,9 +53,9 @@ private:
   RandomNumberGenerator &RNG;
 };
 
-// RandomShuffle is an implementation of std::random_shuffle() that
-// doesn't change across stdlib implementations.  Adapted from a
-// sample implementation at cppreference.com.
+/// RandomShuffle is an implementation of std::random_shuffle() that
+/// doesn't change across stdlib implementations.  Adapted from a
+/// sample implementation at cppreference.com.
 template <class RandomIt, class RandomFunc>
 void RandomShuffle(RandomIt First, RandomIt Last, RandomFunc &&RNG) {
   for (auto i = Last - First - 1; i > 0; --i)