added MicrosoftTeams as webhook_type value in connection docs

Author: rsanbhad

website/docs/r/connection.html.markdown

@@ -48,7 +48,7 @@ The following arguments are supported:
 - `headers` - (Optional) Map of access authorization headers.
 - `custom_headers` - (Optional) Map of custom webhook headers
 - `default_payload` - (Required) Default payload of the webhook.
-- `webhook_type` - (Optional) Type of webhook. Valid values are `AWSLambda`, `Azure`, `Datadog`, `HipChat`, `PagerDuty`, `Slack`, `Webhook`, and `NewRelic`. Default: `Webhook`
+- `webhook_type` - (Optional) Type of webhook. Valid values are `AWSLambda`, `Azure`, `Datadog`, `HipChat`, `PagerDuty`, `Slack`, `Webhook`, `NewRelic`, and `MicrosoftTeams`. Default: `Webhook`
 
 Additional data provided in state