docs: change <> to [] in docs.md (#16632)

Author: KeitoTobi1

doc/docs.md

@@ -3747,7 +3747,7 @@ fn main() {
 
 ```v wip
 
-struct Repo<T> {
+struct Repo[T] {
     db DB
 }
 
@@ -3763,14 +3763,14 @@ struct Post {
 	body string
 }
 
-fn new_repo<T>(db DB) Repo<T> {
-    return Repo<T>{db: db}
+fn new_repo[T](db DB) Repo[T] {
+    return Repo[T]{db: db}
 }
 
 // This is a generic function. V will generate it for every type it's used with.
-fn (r Repo<T>) find_by_id(id int) ?T {
+fn (r Repo[T]) find_by_id(id int) ?T {
     table_name := T.name // in this example getting the name of the type gives us the table name
-    return r.db.query_one<T>('select * from ${table_name} where id = ?', id)
+    return r.db.query_one[T]('select * from ${table_name} where id = ?', id)
 }
 
 db := new_db()
@@ -3782,7 +3782,7 @@ post := posts_repo.find_by_id(1)? // find_by_id<Post>
 
 Currently generic function definitions must declare their type parameters, but in
 future V will infer generic type parameters from single-letter type names in
-runtime parameter types. This is why `find_by_id` can omit `<T>`, because the
+runtime parameter types. This is why `find_by_id` can omit `[T]`, because the
 receiver argument `r` uses a generic type `T`.
 
 Another example: