[DOCS] Minor fix (#317)

Co-authored-by: Min Xu <min.xu.public@gmail.com>

python/src/functions.h

@@ -314,7 +314,7 @@ std::string zeros_docstr = R"pbdoc(
 
     :param shape: Shape of the new array, e.g., (8, 16) or (8, )
     :type shape: tuple of ints
-    :param dtype: Data-type of the new array, e.g., triton.float16
+    :param dtype: Data-type of the new array, e.g., tl.float16
     :type dtype: triton.ir.dtype
   )pbdoc";
 ir::value *zeros(ir::type::block_shapes_t shape, type_code _dtype, ir::builder *builder) {
@@ -673,4 +673,4 @@ ir::value *subscript(ir::value *self, std::vector<py::object> slices, ir::builde
     }
   }
   return builder->create_reshape(self, shape);
-}
+}