Runtime config suggestion for specific game options

Updated README to reflect specific-game environment variable modification alongside the existing global option available through `user_settings.py`.
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@ -170,8 +170,11 @@ Runtime Config Options
Proton can be tuned at runtime to help certain games run. The Steam client sets
some options for known games using the <tt>STEAM_COMPAT_CONFIG</tt> variable.
You can override these options using the environment variables described below.
The best way to set these environment overrides is by renaming
The best way to set these environment overrides for all games is by renaming
"user_settings.sample.py" to "user_settings.py" and modifying it appropriately.
If you want to set a specific game to a different setting than the defaults,
use the `Set Launch Options` under the games `Properties`. You can launch the
game as you would make it `YOUR_VARIABLE=1 %command%` [(source)](https://superuser.com/questions/954041/how-to-set-an-environment-variable-for-an-specific-game-on-steam-for-linux#980437).
To enable an option, set the variable to a non-<tt>0</tt> value. To disable an
option, set the variable to <tt>0</tt>. To use Steam's default configuration, do