update docs

website/source/docs/providers/aws/r/elastic_beanstalk_environment.html.markdown

@@ -55,9 +55,10 @@ off of. Example stacks can be found in the [Amazon API documentation][1]
   [duration](https://golang.org/pkg/time/#ParseDuration) that Terraform should
   wait for an Elastic Beanstalk Environment to be in a ready state before timing
   out.
-* `poll_interval` – (Default: `10s`) The time between polling the AWS API to
+* `poll_interval` – The time between polling the AWS API to
 check if changes have been applied. Use this to adjust the rate of API calls
-for any `create` or `update` action. Minimum `10s`, maximum `60s`
+for any `create` or `update` action. Minimum `10s`, maximum `180s`. Omit this to
+use the default behavior, which is an exponential backoff
 * `tags` – (Optional) A set of tags to apply to the Environment. **Note:** at
 this time the Elastic Beanstalk API does not provide a programatic way of
 changing these tags after initial application