Fix docs

Author: osipovartem

docs/source/library-user-guide/adding-udfs.md

@@ -1075,8 +1075,8 @@ use datafusion_expr::Expr;
 pub struct EchoFunction {}
 
 impl TableFunctionImpl for EchoFunction {
-    fn call(&self, exprs: &[Expr]) -> Result<Arc<dyn TableProvider>> {
-        let Some(Expr::Literal(ScalarValue::Int64(Some(value)))) = exprs.get(0) else {
+    fn call(&self, exprs: &[(datafusion_expr::Expr, Option<std::string::String>)]) -> Result<Arc<dyn TableProvider>> {
+        let Some((Expr::Literal(ScalarValue::Int64(Some(value))), _)) = exprs.get(0) else {
             return plan_err!("First argument must be an integer");
         };
 
@@ -1116,8 +1116,8 @@ With the UDTF implemented, you can register it with the `SessionContext`:
 # pub struct EchoFunction {}
 #
 # impl TableFunctionImpl for EchoFunction {
-#     fn call(&self, exprs: &[Expr]) -> Result<Arc<dyn TableProvider>> {
-#         let Some(Expr::Literal(ScalarValue::Int64(Some(value)))) = exprs.get(0) else {
+#     fn call(&self, exprs: &[(datafusion_expr::Expr, Option<std::string::String>)]) -> Result<Arc<dyn TableProvider>> {
+#         let Some((Expr::Literal(ScalarValue::Int64(Some(value))), _)) = exprs.get(0) else {
 #             return plan_err!("First argument must be an integer");
 #         };
 #