Add complex number support to positive (#447)

Author: kgryte

spec/API_specification/array_api/array_object.py

@@ -792,7 +792,7 @@ def __pos__(self: array, /) -> array:
         Parameters
         ----------
         self: array
-            array instance. Should have a real-valued data type.
+            array instance. Should have a numeric data type.
 
         Returns
         -------

spec/API_specification/array_api/elementwise_functions.py

@@ -1052,7 +1052,7 @@ def positive(x: array, /) -> array:
     Parameters
     ----------
     x: array
-        input array. Should have a real-valued data type.
+        input array. Should have a numeric data type.
 
     Returns
     -------