Fix typo in expm1 docstring and rebase onto master

Author: ndgrigorian

dpctl/tensor/_elementwise_funcs.py

@@ -267,7 +267,7 @@
     usm_ndarray:
         An array containing the element-wise exp(x)-1 values.
         The data type of the returned array is determined by the Type
-        Promotion Rules..
+        Promotion Rules.
 """
 
 expm1 = UnaryElementwiseFunc(