DOC-4238 added Cuckoo filter examples (#3116)

Co-authored-by: Vladyslav Vildanov <117659936+vladvildanov@users.noreply.github.com>

Author: andy-stark-redis

doctests/cuckoo_tutorial_test.go

@@ -0,0 +1,75 @@
+// EXAMPLE: cuckoo_tutorial
+// HIDE_START
+package example_commands_test
+
+import (
+"context"
+"fmt"
+
+"github.com/redis/go-redis/v9"
+)
+
+// HIDE_END
+
+func ExampleClient_cuckoo() {
+ctx := context.Background()
+
+rdb := redis.NewClient(&redis.Options{
+Addr: "localhost:6379",
+Password: "", // no password docs
+DB: 0, // use default DB
+})
+
+// REMOVE_START
+rdb.Del(ctx, "bikes:models")
+// REMOVE_END
+
+// STEP_START cuckoo
+res1, err := rdb.CFReserve(ctx, "bikes:models", 1000000).Result()
+
+if err != nil {
+panic(err)
+}
+
+fmt.Println(res1) // >>> OK
+
+res2, err := rdb.CFAdd(ctx, "bikes:models", "Smoky Mountain Striker").Result()
+
+if err != nil {
+panic(err)
+}
+
+fmt.Println(res2) // >>> true
+
+res3, err := rdb.CFExists(ctx, "bikes:models", "Smoky Mountain Striker").Result()
+
+if err != nil {
+panic(err)
+}
+
+fmt.Println(res3) // >>> true
+
+res4, err := rdb.CFExists(ctx, "bikes:models", "Terrible Bike Name").Result()
+
+if err != nil {
+panic(err)
+}
+
+fmt.Println(res4) // >>> false
+
+res5, err := rdb.CFDel(ctx, "bikes:models", "Smoky Mountain Striker").Result()
+
+if err != nil {
+panic(err)
+}
+
+fmt.Println(res5) // >>> true
+// STEP_END
+
+// Output:
+// OK
+// true
+// true
+// false
+// true
+}