If you look up your monitor's spec either online or in the manual, did it say that the refresh rate can be overclock?
From what I see so far, this monitor has a fixed refresh rate of 75 Hz (double check though bc I could be wrong). Usually monitors that can be overclocked will be advertised with that function to catch more sells.
And no, overclocking a monitor will not damage it as long as it is capable of doing so. I currently have a dell alienware monitor with original 100 Hz refresh rate and 120 Hz overclocked. It's been overclock over over a year and still running perfectly.