nixos/doc/wireless: fix comments

Those had been misplaced by nixfmt.

nixos/doc/manual/configuration/wireless.section.md

@@ -15,16 +15,16 @@ NixOS lets you specify networks for wpa_supplicant declaratively:
 ```nix
 {
   networking.wireless.networks = {
-    echelon = {
     # SSID with no spaces or special characters
+    echelon = {
       psk = "abcdefgh";
     };
-    "echelon's AP" = {
     # SSID with spaces and/or special characters
+    "echelon's AP" = {
       psk = "ijklmnop";
     };
-    echelon = {
     # Hidden SSID
+    echelon = {
       hidden = true;
       psk = "qrstuvwx";
     };