arch: arm: update doc for 8-byte stack alignment option for Cortex-M
This commit updates the documentation of Kconfig option:
STACK_ALIGN_DOUBLE_WORD for Cortex-M microprocessors, stating
that the option is used in ARMv7-M MCUs to enforce 8-byte
stack alignment upon exception entry.
Signed-off-by:
Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
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