docs: fix markdown lint issues in command docs

cmd/obscure/obscure.go

@@ -22,9 +22,8 @@ var commandDefinition = &cobra.Command{
 	Long: `In the rclone config file, human-readable passwords are
 obscured. Obscuring them is done by encrypting them and writing them
 out in base64. This is **not** a secure way of encrypting these
-passwords as rclone can decrypt them - it is to prevent "eyedropping"
-- namely someone seeing a password in the rclone config file by
-accident.
+passwords as rclone can decrypt them - it is to prevent "eyedropping" -
+namely someone seeing a password in the rclone config file by accident.
 
 Many equally important things (like access tokens) are not obscured in
 the config file. However it is very hard to shoulder surf a 64
@@ -34,7 +33,9 @@ This command can also accept a password through STDIN instead of an
 argument by passing a hyphen as an argument. This will use the first
 line of STDIN as the password not including the trailing newline.
 
-    echo "secretpassword" | rclone obscure -
+` + "```sh" + `
+echo "secretpassword" | rclone obscure -
+` + "```" + `
 
 If there is no data on STDIN to read, rclone obscure will default to
 obfuscating the hyphen itself.