Both SSD1306 modules are real parts and both belong in the catalogue -
the mismatch was in the docs, not the parts:
- the 8-pin Adafruit breakout was served a datasheet listing a 4-pin
I2C pinout (VCC/GND/SCL/SDA) that is not its header at all; it now
documents its own 9-way pinout with the I2C and SPI role of each pin;
- the 4-pin I2C module had NO datasheet, because docs resolve by
component id and ssd1306-i2c-4pin.md did not exist - so the part
showed nothing. It has one now.
Each points at the other so it is obvious which one you want.
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