tree-wide: format man page references as foo(1)

src/sysupdate/sysupdate.c

@@ -84,7 +84,7 @@ STATIC_DESTRUCTOR_REGISTER(arg_transfer_source, freep);
 COMMAND(
         "systemd-sysupdate\0",
         "Update OS images.",
-        .man_pages = "systemd-sysupdate.8\0",
+        .man_pages = "systemd-sysupdate(8)\0",
         .pager_flags = &arg_pager_flags,
 );
 

src/sysupdate/sysupdated.c

@@ -2164,7 +2164,7 @@ static int manager_run(Manager *m) {
 COMMAND(
         "systemd-sysupdated\0",
         "Manage system updates.",
-        .man_pages = "systemd-sysupdated.service.8\0",
+        .man_pages = "systemd-sysupdated.service(8)\0",
         .option_namespace = "service",
         .option_groups =
                 "Options\0"

src/sysupdate/updatectl.c

@@ -41,7 +41,7 @@ static const char *arg_host = NULL;
 COMMAND(
         "updatectl\0",
         "Manage system updates.",
-        .man_pages = "updatectl.1\0",
+        .man_pages = "updatectl(1)\0",
         .pager_flags = &arg_pager_flags,
 );