Small documentation and stylistic changes.

Test: art/test.py
Change-Id: Ibc74ee4783314266bf1d027811715058626c57c8
diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index 602e094..5066385 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -949,7 +949,7 @@
 JDWP::JdwpError Dbg::GetInstanceCounts(const std::vector<JDWP::RefTypeId>& class_ids,
                                        std::vector<uint64_t>* counts) {
   gc::Heap* heap = Runtime::Current()->GetHeap();
-  heap->CollectGarbage(false, gc::GcCause::kGcCauseDebugger);
+  heap->CollectGarbage(/* clear_soft_references */ false, gc::GcCause::kGcCauseDebugger);
   VariableSizedHandleScope hs(Thread::Current());
   std::vector<Handle<mirror::Class>> classes;
   counts->clear();
@@ -970,7 +970,7 @@
                                   std::vector<JDWP::ObjectId>* instances) {
   gc::Heap* heap = Runtime::Current()->GetHeap();
   // We only want reachable instances, so do a GC.
-  heap->CollectGarbage(false, gc::GcCause::kGcCauseDebugger);
+  heap->CollectGarbage(/* clear_soft_references */ false, gc::GcCause::kGcCauseDebugger);
   JDWP::JdwpError error;
   ObjPtr<mirror::Class> c = DecodeClass(class_id, &error);
   if (c == nullptr) {
@@ -992,7 +992,7 @@
 JDWP::JdwpError Dbg::GetReferringObjects(JDWP::ObjectId object_id, int32_t max_count,
                                          std::vector<JDWP::ObjectId>* referring_objects) {
   gc::Heap* heap = Runtime::Current()->GetHeap();
-  heap->CollectGarbage(false, gc::GcCause::kGcCauseDebugger);
+  heap->CollectGarbage(/* clear_soft_references */ false, gc::GcCause::kGcCauseDebugger);
   JDWP::JdwpError error;
   ObjPtr<mirror::Object> o = gRegistry->Get<mirror::Object*>(object_id, &error);
   if (o == nullptr) {