website/docs: document WinRM execution time limit

CHANGELOG.md

@@ -30,6 +30,7 @@ IMPROVEMENTS:
   - core: allow removal of all box versions with `--all` flag [GH-3462]
   - command/plugin: Add `--plugin-clean-sources` flag to reset plugin install
       sources, primarily for corp firewalls. [GH-4738]
+  - communicators/winrm: Configurable execution time limit [GH-6213]
   - provisioners/shell: Support interactive mode for elevated PowerShell
       scripts [GH-6185]
   - provisioners/ansible: add new `force_remote_user` option to control whether

website/docs/source/v2/vagrantfile/winrm_settings.html.md

@@ -46,6 +46,12 @@ to use port 4567 to talk to the guest if there is no other option.
 
 <hr>
 
+`config.winrm.execution_time_limit` - The maximum duration that a WinRM
+task can execute for. This defaults to two hours. The format of this value
+must be in this [Microsoft-documented format](https://msdn.microsoft.com/en-us/library/aa382678.aspx).
+
+<hr>
+
 <strong>Warning:</strong> In order for Vagrant to communicate with a Windows
 guest, you must allow unencrypted WinRM connections on the guest machine
 itself. Some public boxes already have this configured, but if you are