Update SUMMARY_320_PI.md

Author: TheFive666

SUMMARY_320_PI.md

@@ -14,6 +14,7 @@
     - [1.4.7 PenHolderPro](1-ProductIntroduction/1.4-AccessoriesTools/1.4.4-Other/1-PenHolderPro.md)
     - [1.4.8 PhoneHolderPro](1-ProductIntroduction/1.4-AccessoriesTools/1.4.4-Other/2-PhoneHolderPro.md)
     - [1.4.9 Single-ended suction pump](1-ProductIntroduction/1.4-AccessoriesTools/1.4.2-PumpCup/singel_pump_en.md)
+    - [1.4.10 Force control gripper](1-ProductIntroduction/1.4-AccessoriesTools/1.4.1-Gripper/jiazhua_pi_en.md)
 
 - [2 Product Feature](2-ProductFeature/2.2_320_PI_product/README.md)
   - [2.1 MachineSpecification](2-ProductFeature/2.2_320_PI_product/2.2.1-MachineSpecification.md)