rewrite comments into one, unified style

code/user/runtime/heap_exports.c

@@ -1,8 +1,4 @@
-// heap_exports.c - public CRT allocator names
-// Intentionally includes nothing.  MSVC/UCRT headers declare malloc/free with
-// compiler attributes that conflict with /Gz in this freestanding build.
-// Keep the real heap implementation in heap.c under private names and expose
-// only these tiny forwarding thunks here.
+// User-mode heap exports. This file exposes allocation entry points expected by user personality DLLs.
 
 #ifdef USER_HEAP_EXPORTS
 #define HEAP_EXPORT __declspec(dllexport)