I looked into it and it seems in esp32_rmt.c on line 53 there is a GitHub URL to a pull request (PR #16293 in the main MicroPython repo). It looks like a remnant from a merge commit message, code ...
This repo contains MicroPython (MP) modules for use in exercising the hardware and interfaces of the using the RP2040 microcontroller based Bus Pirate 5 (BP5) from Dangerous Prototypes. These modules ...