feat(spi): Add return values to SPI begin + comments on SPI buses #4399

Job	Run time
Generate matrix	4s
Push event file	3s
Build (validation, esp32) / Build validation tests for esp32	5m 53s
Build (validation, esp32h2) / Build validation tests for esp32h2	3m 33s
Build (validation, esp32c3) / Build validation tests for esp32c3	4m 11s
Build (validation, esp32s3) / Build validation tests for esp32s3	6m 46s
Build (validation, esp32c6) / Build validation tests for esp32c6	4m 40s
Build (validation, esp32p4) / Build validation tests for esp32p4	4m 5s
Build (validation, esp32s2) / Build validation tests for esp32s2	5m 13s
QEMU	-1s
Hardware	-1s
	34m 26s

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