Disable date stamp in command line reference documentation (#825)

By default, Cobra automatically adds a date stamp to the generated command line reference content. Having a date stamp is not necessarily a bad thing, though it's also doubtful that it is useful enough to justify its presence. However, the formatting of this date stamp causes it to be shown as an item in the table of contents of each command reference page, inappropriately located under the "SEE ALSO" heading. This clutters up the documentation without providing any benefits at all.

Fortunately, Cobra has provided an option to disable this behavior: https://github.com/spf13/cobra/blob/master/doc/README.md#disableautogentag

docsgen/main.go

@@ -29,6 +29,7 @@ func main() {
 	}
 
 	cli := cli.NewCommand()
+	cli.DisableAutoGenTag = true  // Disable addition of auto-generated date stamp
 	err := doc.GenMarkdownTree(cli, os.Args[1])
 	if err != nil {
 		log.Fatal(err)