ESP32 ECO3 added a configurable bit that will cause CAN bus speeds to be halved in new V3 core 32E module.
This bit is in `TWAI_INT_ENA_REG`, bit4 which was previously reserved.
Change respects reserved bit and should not cause issues for previous versions since this bit should not have been written to.
The third field of keywords.txt is used to provide Arduino Language/Libraries Reference links, which are accessed from the Arduino IDE by highlighting the keyword and then selecting "Find in Reference" from the Help or right click menu. Adding values to this field that do not match any existing reference pages results in a "Could not open the URL" error.
Reference:
https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#keywordstxt-format