Remove a stray comma

Author: janmeier

website/pages/api-v16/language.mdx

@@ -218,7 +218,7 @@ const editedAST = visit(ast, {
 ```
 
 Alternatively to providing enter() and leave() functions, a visitor can
-instead, provide functions named the same as the kinds of AST nodes, or
+instead provide functions named the same as the kinds of AST nodes, or
 enter/leave visitors at a named key, leading to tree permutations of
 visitor API: