added temporal eg (#540)

src/vector/backends/numpy.py

@@ -1778,8 +1778,23 @@ def longitudinal(self) -> LongitudinalNumpy:
 
     @property
     def temporal(self) -> TemporalNumpy:
-        """Returns the azimuthal type class for the given ``VectorNumpy4D`` object."""
-        # TODO: Add an example here - see https://github.com/scikit-hep/vector/issues/194
+        """
+        Returns the temporal type class for the given ``VectorNumpy4D`` object.
+
+        Example:
+            >>> import vector
+            >>> vec = vector.array(
+            ... [
+            ...     (1.1, 2.1, 3.1, 4.1),
+            ...     (1.2, 2.2, 3.2, 4.2),
+            ...     (1.3, 2.3, 3.3, 4.3),
+            ...     (1.4, 2.4, 3.4, 4.4)
+            ... ], dtype=[("x", float), ("y", float), ("z", float), ("t", float)]
+            ... )
+            >>> vec.temporal
+            TemporalNumpyT([(4.1,), (4.2,), (4.3,), (4.4,)],
+                   dtype=[('t', '<f8')])
+        """
         return self.view(self._temporal_type)
 
     def _wrap_result(