Correct comment in SPI_Multiple_Buses.ino (#2272)
The default SPI bus is VSPI (see libraries/SPI/src/SPI.cpp). This change corrects a misleading comment in a code example which was stating wrongly that HSPI would be the default one.
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/* The ESP32 has four SPi buses, however as of right now only two of
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* them are available to use, HSPI and VSPI. Simply using the SPI API
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* as illustrated in Arduino examples will use HSPI, leaving VSPI unused.
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* as illustrated in Arduino examples will use VSPI, leaving HSPI unused.
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*
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* However if we simply intialise two instance of the SPI class for both
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* of these buses both can be used. However when just using these the Arduino
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