Crystal frequency instructions ambiguous and incomplete

[ax00b3]

The docs state that we should stick to an 8MHz crystal and then change the values for the PLL M,Q,N,P multiplicators, but change them to what?

Furthermore, the docs direct the user to check the firmware for some keyboard that makes no reference to these values, leaving the user in the dark.

So far I found the following in a completely unrelated keyboard:

#define STM32_PLLM_VALUE                    4
#define STM32_PLLN_VALUE                    96
#define STM32_PLLP_VALUE                    2
#define STM32_PLLQ_VALUE                    4

But I don't know if those values apply to our case. What should the correct values be?