update docs

change building

arch/netctlgui-helper.install

@@ -0,0 +1,7 @@
+post_install() {
+  setcap cap_setuid=ep usr/bin/netctlgui-helper 2>/dev/null || chmod +s usr/bin/ping
+}
+
+post_upgrade() {
+  post_install "$1"
+}