edits

UrumbotXY-Fall2022/README.md

@@ -29,9 +29,12 @@ Complete Bill of Materials (BOM) [here](https://docs.google.com/spreadsheets/d/1
 
 ### Assemble y-plates
 <img src=img/y_bottom.jpg width=300>
-<img src=img/y_top.jpg width=300>
+<img src=img/y_top.jpg width=300><br>
+y-plate top and bottom.
+
 <img src=img/y_double_side.jpg width=300>
 <img src=img/y_single_side.jpg width=300>
+y_plate: two-bearing side, and one-bearing side with adjuster.
 
 
 ### Assemble xy-plate and table