[ci skip] Complete documentation for nonstandard UUIDs

docs/reference/nonstandard-fields.rst

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+.. _reference.nonstandard.fields:
+
+===================
+Nonstandard\\Fields
+===================
+
+.. php:namespace:: Ramsey\Uuid\Nonstandard
+
+.. php:class:: Fields
+
+    Implements :php:interface:`Ramsey\\Uuid\\Rfc4122\\FieldsInterface`.
+
+    Nonstandard\Fields represents the fields of a nonstandard UUID.

docs/reference/nonstandard-uuid.rst

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+.. _reference.nonstandard.uuid:
+
+=================
+Nonstandard\\Uuid
+=================
+
+.. php:namespace:: Ramsey\Uuid\Nonstandard
+
+.. php:class:: Uuid
+
+    Implements :php:interface:`Ramsey\\Uuid\\UuidInterface`.
+
+    Nonstandard\Uuid represents :ref:`nonstandard.other`. In addition to
+    providing the methods defined on the interface, this class additionally
+    provides the following methods.
+
+    .. php:method:: getFields()
+
+        :returns: The fields that comprise this UUID
+        :returntype: Ramsey\\Uuid\\Nonstandard\\Fields