[Keyboard] Add notes on Iris rev6a firmware (#16878)

keyboards/keebio/iris/readme.md

@@ -9,12 +9,20 @@ Hardware Availability: [Keebio](https://keeb.io)
 
 Make example for this keyboard (after setting up your build environment):
 
-    make keebio/iris/rev4:default
+    make keebio/iris/rev6:default
 
 Example of flashing this keyboard:
 
-    make keebio/iris/rev4:default:flash
+    make keebio/iris/rev6:default:flash
 
 See [build environment setup](https://docs.qmk.fm/#/newbs_getting_started) then the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.
 
-A build guide for this keyboard can be found here: [Iris Build Guide](https://docs.keeb.io/iris-build-guide.html)
+A build guide for this keyboard can be found here: [Iris Build Guide](https://docs.keeb.io/iris-rev6-build-guide)
+
+## Iris Rev. 6 Notes
+
+The Iris Rev. 6 and Rev. 6.1 PCBs are nearly identical and have the same firmware (`rev6`) pre-flashed to them that has VIA support enabled. However this stock firmware does not support for Lighting controls in VIA.
+
+To enable Lighting controls in VIA, you will need the `rev6a` firmware. See [Enabling Iris Rev. 6 VIA RGB Controls](https://docs.keeb.io/iris-rev6-rgb-via) for more details.
+
+Both the Rev. 6 and Rev. 6.1 PCBs are compatible with the `rev6a` firmware.

keyboards/keebio/iris/rev6a/config.h

@@ -22,7 +22,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define PRODUCT_ID      0x6356
 #define DEVICE_VER      0x0610
 #define MANUFACTURER    Keebio
-#define PRODUCT         Iris Rev. 6.1
+#define PRODUCT         Iris Rev. 6a
 
 /* key matrix size */
 // Rows are doubled-up