[docs] guide: document current Looking Glass features

doc/words.txt

@@ -1,11 +1,14 @@
+Anime4K
 backend
 backtrace
 BigNavi
 borderless
 Brindus
+cadence
 cgroups
 clang
 cmake
+compositor
 config
 CopySleep
 Debian
@@ -22,6 +25,7 @@ downsampling
 downscaler
 downscaling
 evdev
+ExtraMode
 Flatpak
 framebuffer
 fullscreen
@@ -31,6 +35,7 @@ gnif
 Guanzhong
 hypervisor
 i3
+IddCx
 ie
 imgui
 ini
@@ -55,21 +60,29 @@ msys
 multisampling
 namespace
 Navi
+NvFBC
 Nvidia
 overlayed
+overrun
 pacman
 passthrough
 performant
 pre
+prebuilt
 protanope
 QEMU
+quadraphonic
 Quadro
 radeon
 realtime
 renderer
 repo
+resampler
 Rubenstein
 runtime
+scanout
+Scream
+scRGB
 shm
 spencercw
 submodule
@@ -78,6 +91,7 @@ systemd
 th
 Threadripper
 toolchain
+tooltip
 tritanope
 tunable
 uaccess
@@ -85,12 +99,14 @@ udev
 UEFI
 uncheck
 uncomment
+underrun
 Unigine
 unix
 upscaled
 upscaler
 upscales
 upscaling
+VirtIO
 VM
 vsync
 wayland