Fix description for trunc (#511)

Author: kgryte

Diff for: spec/API_specification/array_api/elementwise_functions.py

@@ -1624,7 +1624,7 @@ def tanh(x: array, /) -> array:
 
 def trunc(x: array, /) -> array:
     """
-    Rounds each element ``x_i`` of the input array ``x`` to the integer-valued number that is closest to but no greater than ``x_i``.
+    Rounds each element ``x_i`` of the input array ``x`` to the nearest integer-valued number that is closer to zero than ``x_i``.
 
     **Special cases**