Updated Xol /A4T BOM (#109)

* Update Bill-of-Materials.md

Added a note about Xol / A4T compatibility

* Update Bill-of-Materials.md

* Update Bill-of-Materials.md

Author: dudewithan02

wiki/Bill-of-Materials.md

@@ -54,6 +54,9 @@ x1 per toolhead
 
 ### Xol / A4T
 
+- [2] m3x45 SHCS **magnetic** (backplate lower mounting screws)
+- [2] m3x12 BHCS / SHCS (backplate upper mounting screws)
+- [2] m3x6 FHCS **magnetic** (preload screws. m3x8 will be too long)
 - You will **not be able** to use stock 2.4 Z joints with Xol or A4T.
 - Replacement of your Z joints with something with a lower profile such as [hartk123's GE5C Z Joint](https://github.com/VoronDesign/VoronUsers/tree/main/printer_mods/hartk1213/Voron2.4_GE5C) or [Ellis'Short Z Joints](https://github.com/VoronDesign/VoronUsers/tree/main/printer_mods/Ellis/Short_Z_Joints) is necessary to avoid bottoming out your Z carriage on the deck panel when using Xol or A4T.