Help: Document HIP standard/extensions properties and variables

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+HIP_STANDARD
+------------
+
+.. versionadded:: 3.21
+
+The HIP/C++ standard requested to build this target.
+
+Supported values are:
+
+``98``
+  HIP C++98
+
+``11``
+  HIP C++11
+
+``14``
+  HIP C++14
+
+``17``
+  HIP C++17
+
+``20``
+  HIP C++20
+
+``23``
+  HIP C++23
+
+If the value requested does not result in a compile flag being added for
+the compiler in use, a previous standard flag will be added instead.  This
+means that using:
+
+.. code-block:: cmake
+
+  set_property(TARGET tgt PROPERTY HIP_STANDARD 11)
+
+with a compiler which does not support ``-std=gnu++11`` or an equivalent
+flag will not result in an error or warning, but will instead add the
+``-std=gnu++98`` flag if supported.  This "decay" behavior may be controlled
+with the :prop_tgt:`HIP_STANDARD_REQUIRED` target property.
+Additionally, the :prop_tgt:`HIP_EXTENSIONS` target property may be used to
+control whether compiler-specific extensions are enabled on a per-target basis.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.
+
+This property is initialized by the value of
+the :variable:`CMAKE_HIP_STANDARD` variable if it is set when a target
+is created.