Update README files to rename 'gripper_open' to 'gripper_open_scale' for clarity

Author: MAGMADIMSUM-RTX

README.md

@@ -105,7 +105,7 @@ These features represent data collected from the robot arms (slave/master). In t
 |---|---:|---|
 | `{dir}_arm_joint_{num}_rad` | rad | Converted from collected data; represents the arm joint angles (slave/master). | 
 | `{dir}_hand_joint_{num}_rad` | rad | Converted from collected data; represents the hand joint angles. | 
-| `{dir}_gripper_open` | - | Value range [0, 1]; `0` means fully closed, `1`means fully open; converted from collected data. | 
+| `{dir}_gripper_open_scale` | - | Value range [0, 1]; `0` means fully closed, `1`means fully open; converted from collected data. | 
 | `{dir}_eef_pos_{axis}` | m | EEF position obtained from robot sdk. |
 | `{dir}_eef_rot_{axis}` | rad | EEF rotation(euler) obtained from robot sdk. |
 

README_zh-CN.md

@@ -95,7 +95,7 @@ dataloader = torch.utils.data.DataLoader(
 |---|---:|---|
 | `{dir}_arm_joint_{num}_rad` | rad | 由采集数据转换而成，表示机械臂的关节角（从臂/主臂）。|
 | `{dir}_hand_joint_{num}_rad` | rad | 由采集数据转换而成，表示手部关节角。|
-| `{dir}_gripper_open` | - | 取值范围为 [0, 1]；`0` 表示完全闭合，`1`表示完全张开；由采集数据转换而成。|
+| `{dir}_gripper_open_scale` | - | 取值范围为 [0, 1]；`0` 表示完全闭合，`1`表示完全张开；由采集数据转换而成。|
 | `{dir}_eef_pos_{axis}` | m | Robot SDK获取的末端位置（单位为米）。|
 | `{dir}_eef_rot_{axis}` | rad | Robot SDK获取的末端姿态（欧拉角，单位为弧度）。|