update docs

ChangeLog.md

@@ -82,6 +82,7 @@
 
 * NanoDroid-Font
   * new script to change the system font (Full package only)
+     * Magisk Mode only
   * controlled by nanodroid_fonts setup variable
   * possible fonts:
      * FAST
@@ -91,6 +92,7 @@
      * SuperMarioMaker
      * SuperMario
   * example: `nanodroid-font --set Splatoon2` and reboot
+     * currently this is not saved during updates
   * shell name: nanodroid-font
   * shell name: nfnt
 

doc/NanoDroidFont.md

@@ -4,6 +4,8 @@
 
 The `nanodroid-font` Script, respectively it's shortcut `nfnt` is used to change the System UI font (reboot required to take effect), this feature exists in Magisk Mode only
 
+The Font is not saved during NanoDroid Updates, thus needs to be re-applied after an update; restoration support during updates is a planned feature
+
 ## Invocation
 
 From within a terminal on your device, for example `adb shell` or `Termux` invoke the script using either