[initcpiocfg] Document this module

src/modules/initcpiocfg/module.desc

@@ -1,7 +1,13 @@
 # SPDX-FileCopyrightText: no
 # SPDX-License-Identifier: CC0-1.0
+#
+# Writes a mkinitcpio.conf into the target system. It copies
+# the host system's /etc/mkinitcpio.conf, and replaces any
+# HOOKS, MODULES, and FILES lines with calculated values
+# based on what the installation (seems to) need.
 ---
 type:       "job"
 name:       "initcpiocfg"
 interface:  "python"
 script:     "main.py"
+noconfig:   true