Editorial fix in vector section

adoc/chapters/programming_interface.adoc

@@ -16937,8 +16937,8 @@ The vector supports member functions that allow construction of a new vector
 from a swizzled set of component elements.
 
 [code]#vec<typename _DataT_, int _NumElements_># is a vector type that compiles
-down to a <<backend>> built-in vector types on SYCL devices, where possible, and
-provides compatible support on the host or when it is not possible.
+down to a <<backend>> built-in vector type on SYCL devices, where possible, and
+provides compatible support on the host when not possible.
 The [code]#vec# class is templated on its number of elements and its element
 type.
 The number of elements parameter, _NumElements_, can be one of: 1, 2, 3, 4, 8 or 16.