Change the Linux install instructions to recommend X11 over Wayland

See issue #8 comments for the reasoning behind this.

README.rst

@@ -143,9 +143,12 @@ upload releases to PyPI.org, but everything can still be imported using
 replace :code:`dragonfly` with :code:`dragonfly2` or remove lines like this
 altogether.
 
-If you are installing this on X11/Linux, you will also need to install the
+If you are installing this on Linux, you will also need to install the
 `xdotool <https://www.semicomplete.com/projects/xdotool/>`__ program for the
-``Key`` and ``Text`` actions to work.
+``Key`` and ``Text`` actions to work. Please note that Dragonfly is only
+fully functional in an X11 session. Input action classes, application
+contexts and the ``Window`` class will **not** be functional under Wayland.
+It is recommended that Wayland users switch to X11.
 
 If you have dragonfly installed under the original *dragonfly*
 distribution name, you'll need to remove the old version using:

documentation/installation.txt

@@ -41,9 +41,12 @@ upload releases to PyPI.org, but everything can still be imported using
 replace :code:`dragonfly` with :code:`dragonfly2` or remove lines like this
 altogether.
 
-If you are installing this on X11/Linux, you will also need to install the
+If you are installing this on Linux, you will also need to install the
 `xdotool <https://www.semicomplete.com/projects/xdotool/>`__ program for the
-``Key`` and ``Text`` actions to work.
+``Key`` and ``Text`` actions to work. Please note that Dragonfly is only
+fully functional in an X11 session. Input action classes, application
+contexts and the ``Window`` class will **not** be functional under Wayland.
+It is recommended that Wayland users switch to X11.
 
 If you have dragonfly installed under the original *dragonfly*
 distribution name, you'll need to remove the old version using: