docs: update limit-count.md to add redis_password in `redis-cluster` policy (#4153)

diff --git a/docs/en/latest/plugins/limit-count.md b/docs/en/latest/plugins/limit-count.md
index d90c38b..7144ca9 100644
--- a/docs/en/latest/plugins/limit-count.md
+++ b/docs/en/latest/plugins/limit-count.md
@@ -131,6 +131,7 @@
               "127.0.0.1:5000",
               "127.0.0.1:5001"
             ],
+            "redis_password": "password",
             "redis_cluster_name": "redis-cluster-1"
         }
     },
diff --git a/docs/zh/latest/plugins/limit-count.md b/docs/zh/latest/plugins/limit-count.md
index 07a188b..2539286 100644
--- a/docs/zh/latest/plugins/limit-count.md
+++ b/docs/zh/latest/plugins/limit-count.md
@@ -136,6 +136,7 @@
                 "127.0.0.1:5000",
                 "127.0.0.1:5001"
             ],
+            "redis_password": "password",
             "redis_cluster_name": "redis-cluster-1"
         }
     },