Remove outdated known issue from the Known Issues list of the documentation.

LUFA/DoxygenPages/KnownIssues.txt

@@ -25,13 +25,11 @@
   *  - XMEGA Architecture
   *    \warning The XMEGA device support is currently <b>experimental</b> (incomplete and/or non-functional), and is included for preview purposes only.
   *
-  *    - No demos, bootloaders or projects have been ported for the XMEGA devices in the current release,
-  *      although the architecture is supported in the LUFA core library.
   *    - Endpoints of more than 64 bytes are not currently supported in this release.
   *    - Isochronous endpoints are not currently supported in this release. As a result, the audio class
   *      cannot be used on XMEGA devices.
   *    - Multiple-bank endpoints are not currently supported in this release.
-  *    - Early revisions of the ATXMEGA128A1U are incompatible with LUFA, due to their various errata
+  *    - Early silicon revisions of the ATXMEGA128A1U are incompatible with LUFA, due to their various errata
   *      relating to the USB controller.
   *  - Architecture Independent
   *    - The HID parser fails for array type elements that have a MIN and MAX usage applied; each element