Update FAQ to mention HID keyboard

FAQ.md

@@ -118,13 +118,17 @@ In developer options, enable:
 
 ### Special characters do not work
 
-Injecting text input is [limited to ASCII characters][text-input]. A trick
-allows to also inject some [accented characters][accented-characters], but
-that's all. See [#37].
+The default text injection method is [limited to ASCII characters][text-input].
+A trick allows to also inject some [accented characters][accented-characters],
+but that's all. See [#37].
+
+Since scrcpy v1.20 on Linux, it is possible to simulate a [physical
+keyboard][hid] (HID).
 
 [text-input]: https://github.com/Genymobile/scrcpy/issues?q=is%3Aopen+is%3Aissue+label%3Aunicode
 [accented-characters]: https://blog.rom1v.com/2018/03/introducing-scrcpy/#handle-accented-characters
 [#37]: https://github.com/Genymobile/scrcpy/issues/37
+[hid]: README.md#physical-keyboard-simulation-hid
 
 
 ## Client issues