* src/dispnew.c (syms_of_display):
* src/frame.c (Fwindow_system): Revise doc strings to mention
the `android' value.
`pc' for a direct-write MS-DOS frame.
`pgtk' for an Emacs frame using pure GTK facilities.
`haiku' for an Emacs frame running in Haiku.
+ `android' for an Emacs frame running in Android.
Use of this variable as a boolean is deprecated. Instead,
use `display-graphic-p' or any of the other `display-*-p'
`pc' for a direct-write MS-DOS frame.
`pgtk' for an Emacs frame using pure GTK facilities.
`haiku' for an Emacs frame running in Haiku.
- `android' for an Emacs frame running in Android/
+ `android' for an Emacs frame running in Android.
FRAME defaults to the currently selected frame.