developer notes: updates for C++11

- boost::scoped_ptr is obsolete
- std::vector::data replaces begin_ptr / end_ptr

doc/developer-notes.md

@@ -265,7 +265,7 @@ General C++
       the `.h` to the `.cpp` should not result in build errors
 
 - Use the RAII (Resource Acquisition Is Initialization) paradigm where possible. For example by using
-  `scoped_pointer` for allocations in a function.
+  `unique_ptr` for allocations in a function.
 
   - *Rationale*: This avoids memory and resource leaks, and ensures exception safety
 
@@ -284,10 +284,9 @@ C++ data structures
   - *Rationale*: Behavior is undefined. In C++ parlor this means "may reformat
     the universe", in practice this has resulted in at least one hard-to-debug crash bug
 
-- Watch out for vector out-of-bounds exceptions. `&vch[0]` is illegal for an
-  empty vector, `&vch[vch.size()]` is always illegal. Use `begin_ptr(vch)` and
-  `end_ptr(vch)` to get the begin and end pointer instead (defined in
-  `serialize.h`)
+- Watch out for out-of-bounds vector access. `&vch[vch.size()]` is illegal,
+  including `&vch[0]` for an empty vector. Use `vch.data()` and `vch.data() +
+  vch.size()` instead.
 
 - Vector bounds checking is only enabled in debug mode. Do not rely on it