docs: fix grid/branch links

grid/branch/branch.md

@@ -27,7 +27,9 @@ The branch is an active device for power distribution that allows to measure and
  
 [<img src="docs/branch_3d-bottom.png"  width="208" height="100">](docs/branch_3d-bottom.png)
 &nbsp;
-[<img src="docs/branch_brd.png"  width="95" height="100">](docs/branch_brd.png)
+[<img src="docs/branch_brd-mcu.png"  width="196" height="100">](docs/branch_brd-mcu.png)
+&nbsp;
+[<img src="docs/branch_brd-conn.png"  width="197" height="100">](docs/branch_brd-conn.png)
 
 
 ## Related Links