Apply the pre-commit hook whitespace fixes to all files in the repo. (Line endings, blank lines at end of file, trailing whitespace)
SPI Slave =========== - Correct the configuration of mode 0~3 using new config in the TRM - Split the workaround for DMA in mode 0/2 out of normal config, to make it clear. - Update timing and speed document for the SPI slave. Resolves https://github.com/espressif/esp-idf/issues/1346, https://github.com/espressif/esp-idf/issues/2393