Small documentation and stylistic changes.

Test: art/test.py
Change-Id: Ibc74ee4783314266bf1d027811715058626c57c8
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index a6681ec..8a604db 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -2678,7 +2678,7 @@
   }
   if (GetCompilerOptions().IsBootImage()) {
     // Prune garbage objects created during aborted transactions.
-    Runtime::Current()->GetHeap()->CollectGarbage(true);
+    Runtime::Current()->GetHeap()->CollectGarbage(/* clear_soft_references */ true);
   }
 }