Added TLS security protocol for Powershell downloads (#73226)

##### SUMMARY
Added `[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12` to the Powershell scripts that use a file download. If not specified the script won't be allowed to download data from the mentioned URL's.


##### ISSUE TYPE
- Docs Pull Request

+label: docsite_pr

docs/docsite/rst/user_guide/windows_setup.rst

@@ -37,6 +37,7 @@ This is an example of how to run this script from PowerShell:
 
 .. code-block:: powershell
 
+    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
     $url = "https://raw.githubusercontent.com/jborean93/ansible-windows/master/scripts/Upgrade-PowerShell.ps1"
     $file = "$env:temp\Upgrade-PowerShell.ps1"
     $username = "Administrator"
@@ -95,6 +96,7 @@ The following PowerShell command will install the hotfix:
 
 .. code-block:: powershell
 
+    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
     $url = "https://raw.githubusercontent.com/jborean93/ansible-windows/master/scripts/Install-WMF3Hotfix.ps1"
     $file = "$env:temp\Install-WMF3Hotfix.ps1"
 
@@ -120,6 +122,7 @@ To use this script, run the following in PowerShell:
 
 .. code-block:: powershell
 
+    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
     $url = "https://raw.githubusercontent.com/ansible/ansible/devel/examples/scripts/ConfigureRemotingForAnsible.ps1"
     $file = "$env:temp\ConfigureRemotingForAnsible.ps1"