Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

The ESP32 Reference Manual 5.3 and IDF comments incorrectly describe the threshold fields for the TXFIFO_EMPTY and RXFIFO_FULL interrupt. Correct would be:
RXFIFO_FULL threshold is set by rx_mem_full_thrhd and rxfifo_full_thrhd
TXFIFO_EMPTY threshold is set by tx_mem_empty_thrhd and txfifo_empty_thrhd

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