Update description to accommodate complex number input

Author: kgryte

spec/API_specification/array_api/elementwise_functions.py

@@ -519,7 +519,7 @@ def equal(x1: array, x2: array, /) -> array:
 
 def exp(x: array, /) -> array:
     """
-    Calculates an implementation-dependent approximation to the exponential function, having domain ``[-infinity, +infinity]`` and codomain ``[+0, +infinity]``, for each element ``x_i`` of the input array ``x`` (``e`` raised to the power of ``x_i``, where ``e`` is the base of the natural logarithm).
+    Calculates an implementation-dependent approximation to the exponential function for each element ``x_i`` of the input array ``x`` (``e`` raised to the power of ``x_i``, where ``e`` is the base of the natural logarithm).
 
     **Special cases**