Datasheet section for SysTick Interrupt/APB2ENR

[burbschat]

In the tutorial where the SysTick interrupt is explained it is written:

Next, add an API function that configures it. We need to enable SysTick in the SYSTICK->CTRL register, and also we must clock it via the RCC->APB2ENR, described in the section 7.4.14:

I wanted to check the datasheet to check the details on why we need to use APB2ENR but I can't seem to find a section 7.4.14.
I looked at the datasheet for the mcu used in the tutorial but there is no section 7.4.
I further checked the cortex M4 reference manual to see if something might be written there but could not find anything either (I assume APB2ENR is a stm32 peripheral so I'd not expect to find anything related in the M4 manual anyways).

I also found that it would be great if there was a link to to cortex m4 reference manual (perhaps there is one which I just missed?).

Perhaps someone can point me to the manual referenced here containing the bespoken section 7.4.14. I tried to search the manual for myself but could not find anything that would mention a relation between the SysTick interrupt and APB2.