win_updates Add information/example wrt. reboots (#49834)

This documents two common issues related to rebooting Windows systems.
- Updates can take a long time being applied during reboot
- Reboots can cause the WinRM service to start before system has settled

lib/ansible/modules/windows/win_reboot.py

@@ -87,17 +87,18 @@ EXAMPLES = r'''
   win_reboot:
   when: iis_install.reboot_required
 
-# One way to ensure the system is reliable, is to add a delay before running the next task
-- name: Reboot a machine that takes time to settle after being booted
-  win_reboot:
-    post_reboot_delay: 120
-
-# Alternatively, you can set WinRM to a delayed startup
+# One way to ensure the system is reliable, is to set WinRM to a delayed startup
 - name: Ensure WinRM starts when the system has settled and is ready to work reliably
   win_service:
     name: WinRM
     start_mode: delayed
 
+
+# Additionally, you can add a delay before running the next task
+- name: Reboot a machine that takes time to settle after being booted
+  win_reboot:
+    post_reboot_delay: 120
+
 # Or you can make win_reboot validate exactly what you need to work before running the next task
 - name: Validate that the netlogon service has started, before running the next task
   win_reboot:

lib/ansible/modules/windows/win_updates.py

@@ -99,10 +99,13 @@ notes:
 - C(win_updates) must be run by a user with membership in the local Administrators group.
 - C(win_updates) will use the default update service configured for the machine (Windows Update, Microsoft Update, WSUS, etc).
 - By default C(win_updates) does not manage reboots, but will signal when a
-  reboot is required with the I(reboot_required) return value, as of Ansible 2.5
+  reboot is required with the I(reboot_required) return value, as of Ansible v2.5
   C(reboot) can be used to reboot the host if required in the one task.
 - C(win_updates) can take a significant amount of time to complete (hours, in some cases).
   Performance depends on many factors, including OS version, number of updates, system load, and update server load.
+- Beware that just after C(win_updates) reboots the system, the Windows system may not have settled yet
+  and some base services could be in limbo. This can result in unexpected behavior.
+  Check the examples for ways to mitigate this.
 - More information about PowerShell and how it handles RegEx strings can be
   found at U(https://technet.microsoft.com/en-us/library/2007.11.powershell.aspx).
 '''
@@ -148,6 +151,18 @@ EXAMPLES = r'''
     blacklist:
     - Windows Malicious Software Removal Tool for Windows
     - \d{4}-\d{2} Cumulative Update for Windows Server 2016
+
+# One way to ensure the system is reliable just after a reboot, is to set WinRM to a delayed startup
+- name: Ensure WinRM starts when the system has settled and is ready to work reliably
+  win_service:
+    name: WinRM
+    start_mode: delayed
+
+# Optionally, you can increase the reboot_timeout to survive long updates during reboot
+- name: Ensure we wait long enough for the updates to be applied during reboot
+  win_updates:
+    reboot: yes
+    reboot_timeout: 3600
 '''
 
 RETURN = r'''