Add missing docstrings

src/shellfu/saturnin.sh

 shellfu import pretty
 
 saturnin__help() {
+    #
+    # Print simple help message (basically just list of commands)
+    #
     {
         echo "built-in commands:"
         echo "    conf"
 }
 
 saturnin__lssc() {
+    #
+    # List subcommands
+    #
     find "$SATURNIN_LIBEXEC" \
         -mindepth 1 \
         -maxdepth 1 \
 }
 
 saturnin__runsc() {
+    #
+    # Run subcommand $SATURNIN_SUBCOMMAND
+    #
     local lexpath
     lexpath+="$SATURNIN_LIBEXEC/"
     lexpath+="$SATURNIN_LIBEXEC_PREFIX$SATURNIN_SUBCOMMAND"