docs: update command docs to new style

docs/content/commands/rclone_completion_powershell.md

@@ -1,40 +1,43 @@
 ---
 title: "rclone completion powershell"
-description: "Generate the autocompletion script for powershell"
+description: "Output powershell completion script for rclone."
 slug: rclone_completion_powershell
 url: /commands/rclone_completion_powershell/
 # autogenerated - DO NOT EDIT, instead edit the source code in cmd/completion/powershell/ and as part of making a release run "make commanddocs"
 ---
 # rclone completion powershell
 
-Generate the autocompletion script for powershell
+Output powershell completion script for rclone.
+
+## Synopsis
 
-# Synopsis
 
 Generate the autocompletion script for powershell.
 
 To load completions in your current shell session:
 
-	rclone completion powershell | Out-String | Invoke-Expression
+    rclone completion powershell | Out-String | Invoke-Expression
 
 To load completions for every new session, add the output of the above command
 to your powershell profile.
 
+If output_file is "-" or missing, then the output will be written to stdout.
+
 
 ```
-rclone completion powershell [flags]
+rclone completion powershell [output_file] [flags]
 ```
 
-# Options
+## Options
 
 ```
-  -h, --help              help for powershell
-      --no-descriptions   disable completion descriptions
+  -h, --help   help for powershell
 ```
 
+
 See the [global flags page](/flags/) for global options not listed here.
 
 # SEE ALSO
 
-* [rclone completion](/commands/rclone_completion/)	 - Generate the autocompletion script for the specified shell
+* [rclone completion](/commands/rclone_completion/)	 - Output completion script for a given shell.