New variants of existing boards introduced to the wiki

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New variants of existing boards introduced to the wiki
by on (#23748)
I've added new boards, FKROM, HROM and SROM, all found by Bootgod (the last two being just variants of NROM).

I also added info about CNROM diodes and CNROM games with protected CHRROMs (mapper 185). I made up what I put from what I logically understand, but if anyone found something wrong go ahead.

Also I'd like to put more precision for chip pinouts for all boards. The only document available only treats some of the chips (32k , 128k and 256k for both PRG and CHR, but gives no info about existing other sizes of chips, and not all chips have the same pinout everywhere (as seen on boards such as SL1ROM)).