Add complex number support to negative (#448)

Author: kgryte

spec/API_specification/array_api/array_object.py

@@ -746,10 +746,13 @@ def __neg__(self: array, /) -> array:
         .. note::
            For signed integer data types, the numerical negative of the minimum representable integer is implementation-dependent.
 
+        .. note::
+           If ``self`` has a complex floating-point data type, both the real and imaginary components for each ``self_i`` must be negated (a result which follows from the rules of complex number multiplication).
+
         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

@@ -1014,10 +1014,13 @@ def negative(x: array, /) -> array:
     .. note::
        For signed integer data types, the numerical negative of the minimum representable integer is implementation-dependent.
 
+    .. note::
+       If ``x`` has a complex floating-point data type, both the real and imaginary components for each ``x_i`` must be negated (a result which follows from the rules of complex number multiplication).
+
     Parameters
     ----------
     x: array
-        input array. Should have a real-valued data type.
+        input array. Should have a numeric data type.
 
     Returns
     -------