Update documentation in w64devkit.ini

As of 3cacd96, the "known bugs" comment is no longer true for typical
use cases (x64 Windows 10 and later).

The UTF-8 comment came out of abusing GetPrivateProfileStringA. It was
replaced in 568efdc with a custom parser.

src/w64devkit.ini

@@ -1,5 +1,4 @@
 ; w64devkit.ini -- configuration for w64devkit.exe
-; This file must be encoded as UTF-8.
 
 [w64devkit]
 ; home: Sets the HOME environment variable for the shell. Place a
@@ -14,9 +13,6 @@
 ; title: Sets the initial title for the new console window. This value
 ; may also contain environment variables.
 ;
-; Known bugs: busybox-w32 uses the narrow API and does not support wide
-; paths, so be mindful when using non-ASCII paths for this value.
-;
 ;home = ..\home
 ;home = %HOMEDRIVE%%HOMEPATH%
 ;title = %USERNAME%@%COMPUTERNAME% [%W64DEVKIT_HOME% %W64DEVKIT%]