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Improve basepri explanation

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Co-authored-by: Henrik Tjäder <henrik@tjaders.com>
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book/en/src/internals/targets.md
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# Target Architecture
While RTIC can currently target all Cortex-m devices there are some key architecure differences that
users should be aware. Namely the absence of hardware priority ceiling (BASEPRI) support in the
users should be aware of. Namely the absence of Base Priority Mask Register (`BASEPRI`) which lends itself exceptionally well to the hardware priority ceiling support used in RTIC, in the
ARMv6-M and ARMv8-M-base architectures requires a few tweaks from RTIC to deliver the same
features. These differences result in two flavors of critical sections: priority ceiling, and source
masking. Table 1 below shows a list of Cortex-m processors and which type of critical section they