Update README.md

Author: vmanoj1996

README.md

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 ## Tips and Tricks
-- ***MuJoCo version update*** - Open install.m and change MJ_VER to desired MuJoCo physics engine version. 
+- ***MuJoCo version update*** - Open install.m and change MJ_VER to the desired MuJoCo physics engine version. 
 - ***Code generation*** - The MuJoCo Plant block supports code generation (Simulink Coder) and monitor and tune for host target. Refer to mj_monitorTune.slx for more info.
 - ***Performance improvement*** - In case you want to reduce the mask initialization overhead, you can directly use the underlying S-Function. Select the MuJoCo Plant block and Ctrl+U to look under the subsystem mask. Make sure to call the initialization functions (whenever the MJCF XML model changes).