change dimension pic (#495)

Author: tokirobot

website/docs/hardware/openarm-2.0/general.mdx

@@ -39,7 +39,7 @@ The support pillars are made of MiSUMi aluminum frames, making it easy to adjust
 The base plate has evenly spaced M6 taps, allowing it to be fixed directly to a table or other surface.
 Each joint has a mechanical limit that restricts the range of motion for safety.
 
-<BlockImage src="hardware/openarm-2.0/general/dimensions.png" alt="OpenArm 2.0 Dimensions" />
+<BlockImage src="hardware/openarm-2.0/general/v2_mech_stop_conf.png" alt="OpenArm 2.0 Dimensions" />
 
 ## Payload definition