Update README.md

README.md

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 #### TT corner
 ![image](./docs/plots/tt_dc_vdd_io.png)
 ![image](./docs/plots/tt_dc_vdd_psrr.png)
-![image](./docs/plots/tt_dc_temp_io.png)
+![image](./docs/plots/tt_temp_io.png)
 ![image](./docs/plots/tt_tran_io.png)
 
 Status and Issues