Add WINDOWS_CONTAINER to environment type

website/docs/r/codebuild_project.html.markdown

@@ -176,7 +176,7 @@ The following arguments are supported:
 
 * `compute_type` - (Required) Information about the compute resources the build project will use. Available values for this parameter are: `BUILD_GENERAL1_SMALL`, `BUILD_GENERAL1_MEDIUM` or `BUILD_GENERAL1_LARGE`
 * `image` - (Required) The *image identifier* of the Docker image to use for this build project ([list of Docker images provided by AWS CodeBuild.](https://docs.aws.amazon.com/codebuild/latest/userguide/build-env-ref-available.html)). You can read more about the AWS curated environment images in the [documentation](https://docs.aws.amazon.com/codebuild/latest/APIReference/API_ListCuratedEnvironmentImages.html).
-* `type` - (Required) The type of build environment to use for related builds. The only valid value is `LINUX_CONTAINER`.
+* `type` - (Required) The type of build environment to use for related builds. Valid values: `LINUX_CONTAINER`, `WINDOWS_CONTAINER`.
 * `environment_variable` - (Optional) A set of environment variables to make available to builds for this build project.
 * `privileged_mode` - (Optional) If set to true, enables running the Docker daemon inside a Docker container. Defaults to `false`.