Add ESP32-E22 review and fix sSDR compatibility notes on the M.2 modules page

[munzzyy]

Closes #405.

I looked into the ESP32-E22 to answer the issue. It's a real, certified part (Espressif's product page, the Wi-Fi CERTIFIED 6E announcement), and the Linux driver is genuinely open source (espressif/esp32e22-linux-driver). But I couldn't confirm it fits our M.2 port. Espressif's module page lists SDIO 3.0 as one of the ESP32-E22-M2-1's host interfaces, and SDIO only exists on Key E sockets, not Key B. Espressif hasn't published the module's actual key type, but I couldn't find a single SDIO-capable Wi-Fi/Bluetooth M.2 card that isn't Key E, so I wrote the entry as "unconfirmed, probably doesn't fit" rather than adding it to the list outright. The driver currently uses PCIe for Wi-Fi and USB for Bluetooth, which are both wired on Key B, so a Key B variant of this module would likely work if one ever ships.

While I was in there I also fixed the sSDR listing. It's named as an SDR example with a plain crowdsupply link and no caveats, but per Wavelet Lab's own docs, the current Rev3 is Key M and can't physically go into our Key B slot, and Rev2 is B+M so it fits mechanically but only gets a single PCIe lane out of the two it wants. Left the USB 2.0 path in as the one part that works cleanly on both revisions.