nixos/strongswan-swanctl: Fix build of manual

Commit 401370287a9b74fc18539fe9c0bdc7ac9df9cf22 introduced a small error
where the closing tag of <literal/> was an opening tag instead.

Signed-off-by: aszlig <aszlig@nix.build>
Cc: @basvandijk, @xeji

aszlig a346f153 41c05a72

Changed files
+1 -1
nixos
modules
services
networking
strongswan-swanctl
+1 -1
nixos/modules/services/networking/strongswan-swanctl/swanctl-params.nix
···
Enable hardware offload for this CHILD_SA, if supported by the IPsec
implementation. The value <literal>yes</literal> enforces offloading
and the installation will fail if it's not supported by either kernel or
-
device. The value <literal>auto<literal> enables offloading, if it's
+
device. The value <literal>auto</literal> enables offloading, if it's
supported, but the installation does not fail otherwise.
'';