Ivan Grokhotkov f94035ad85 spi_flash: state that esp_partition_iterator_release allows NULL arg
The implementation allows passing the NULL argument, and the function
is used in the examples accordingly. Fix the discrepancy in the
doxygen comment.

Closes https://github.com/espressif/esp-idf/issues/7545
2021-09-10 20:55:01 +02:00
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