Update crypttab/fstab documentation.

Author: Andrei-Pozolotin

crypttab

@@ -1,15 +1,20 @@
 # This file is part of https://github.com/random-archer/mkinitcpio-systemd-tool
 
-# crypttab: mappings for encrypted partitions
+# crypttab: mappings for encrypted partitions in initramfs
+# file location in real root: /etc/mkinitcpio.d/crypttab
+# file location in initramfs: /etc/crypttab
 
 # crypttab format:
 # https://wiki.archlinux.org/index.php/Dm-crypt/System_configuration#crypttab
 
 # how crypttab is used by systemd
 # https://www.freedesktop.org/software/systemd/man/systemd-cryptsetup-generator.html
+# https://github.com/systemd/systemd/blob/master/src/cryptsetup/cryptsetup-generator.c
+
+# note: use password=none to force cryptsetup password agent prompt
 
 # provide here mapper partition UUID (instead of kernel command line)
 
-# <name>     <device>                 <password>       <options>
-#  root      UUID=${UUID_ROOT}          none             luks
-#  swap      UUID=${UUID_SWAP}          none             luks 
+# <mapper-name>   <block-device>       <password/keyfile>   <crypto-options>
+#  root           UUID={{UUID_ROOT}}       none                luks
+#  swap           UUID={{UUID_SWAP}}       none                luks 

fstab

@@ -1,6 +1,8 @@
 # This file is part of https://github.com/random-archer/mkinitcpio-systemd-tool
 
-# fstab: mappings for direct partitions
+# fstab: mappings for direct partitions in initramfs 
+# file location in real root: /etc/mkinitcpio.d/fstab
+# file location in initramfs: /etc/fstab
 
 # fstab format:
 # https://wiki.archlinux.org/index.php/Fstab
@@ -9,10 +11,11 @@
 # https://www.freedesktop.org/software/systemd/man/systemd-fstab-generator.html
 # https://github.com/systemd/systemd/blob/master/src/fstab-generator/fstab-generator.c
 
-# note: provide /sysroot/ folder inside initramfs disk image
+# note: provide /sysroot folder inside initramfs disk image
 # note: remove "root=/dev/mapper/root" stanza from kernel command line
 
-# provide here root partition description (instead of kernel command line)
+# provide here root partition mapping (instead of kernel command line)
 
-#  <file system>        <dir>      <type>    <option>                         <dump> <pass>
-#  /dev/mapper/root     /sysroot    auto     x-systemd.device-timeout=9999h     0     1
+#  <block-device>       <mount-point>    <fs-type>    <mount-options>                   <dump>  <fsck>
+#  /dev/mapper/root      /sysroot         auto         x-systemd.device-timeout=9999h     0       1
+#  /dev/mapper/swap      none             swap         x-systemd.device-timeout=9999h     0       0