Fixed typo in documentation

README.md

@@ -71,7 +71,7 @@ module "kubernetes" {
 | labels | A set of key/value label pairs to assign to the Kubernetes cluster. | `map(string)` | `{}` | no |
 | master\_auto\_upgrade | Boolean flag that specifies if master can be upgraded automatically. | `bool` | `true` | no |
 | master\_locations | List of locations where cluster will be created. If list contains only one<br>location, will be created zonal cluster, if more than one -- regional. | <pre>list(object({<br>  zone      = string<br>  subnet_id = string<br>}))</pre> | n/a | yes |
-| master\_maintenance\_window | List of structures that specifies maintenance windows, when auto update for master is allowed. | `list(map(string))` | `[]` | no |
+| master\_maintenance\_windows | List of structures that specifies maintenance windows, when auto update for master is allowed. | `list(map(string))` | `[]` | no |
 | master\_public\_ip | Boolean flag. When true, Kubernetes master will have visible ipv4 address. | `bool` | `true` | no |
 | master\_region | Name of region where cluster will be created. Required for regional cluster,<br>not used for zonal cluster. | `string` | `null` | no |
 | master\_version | Version of Kubernetes that will be used for master. | `string` | `null` | no |