Improve documentation

docs/libcudacxx/standard_api/utility_library/memory.rst

@@ -1,9 +1,26 @@
 .. _libcudacxx-standard-api-utility-memory:
 
-``<cuda/std/memory>``
+<cuda/std/memory>
 ======================
 
 Provided functionalities
 ------------------------
 
-- ``cuda::std::assume_aligned``, backported to C++11. See the C++ documentation of `std::assume_aligned()> <https://en.cppreference.com/w/cpp/memory/assume_aligned>`_
+- ``cuda::std::addressof``. See the C++ documentation of `std::assume_aligned()<https://en.cppreference.com/w/cpp/memory/addressof>`_
+- ``cuda::std::align``. See the C++ documentation of `std::assume_aligned()<https://en.cppreference.com/w/cpp/memory/align>`_
+- ``cuda::std::assume_aligned``. See the C++ documentation of `std::assume_aligned()<https://en.cppreference.com/w/cpp/memory/assume_aligned>`_
+- ``cuda::std::destroy_n``. See the C++ documentation of `std::assume_aligned()<https://en.cppreference.com/w/cpp/memory/destroy_n>`_
+- ``cuda::std::destroy``. See the C++ documentation of `std::assume_aligned()<https://en.cppreference.com/w/cpp/memory/destroy>`_
+- Uninitialized memory algorithms. See the C++ documentation of `std::assume_aligned()<https://en.cppreference.com/w/cpp/memory>`_
+
+Extensions
+----------
+
+-  Most features are available from C++11 onwards.
+-  All features are available at compile time if compiler support is sufficient.
+
+Restrictions
+------------
+
+- The features that are explicitly named in the standard `construct_at` and `destroy_at` are only available in C++20
+- The specialized memory algorithms are not parallel