Update install documentation

[jabeler]

Step 2 of the install guide says to download the MHI2_US_POG11_K5186_1_MU1476_AIO file. However, this file does not exist in the linked location, and is instead appears to be named MHI2_US_POG11_K5186_1_MU1476_AIO_20220723.

It probably makes sense to update the install steps so people are not downloading the original/unmodified file MHI2_US_POG11_K5186_MU1476 which is very closely named to the file listed in the guide.

Thanks for putting this together! 🙏