Update proto.md

[mdavidsaver]

Fix markdown formatting and describe alternate 0x4000 ROM location.

[mdavidsaver]

@ldoolitt Based on reading the following, I think the description added is accurate.

feed-core/src/driver/device.cpp

Lines 41 to 44 in 28377d9

	// N.B: Newer devices have a relocated ROM at address 0x4000. On these,
	// 2K aperture at 0x800 is guaranteed to be 0x0 and not decode to a
	// valid ROM. Thus, we first attempt to parse the ROM at the original
	// 0x800 location and move on to 0x4000 if unsuccessful.

feed-core/src/driver/device.cpp

Lines 55 to 60 in 28377d9

	jrom16_info.name = "ROM 16K";
	jrom16_info.description = "Static configuration";
	jrom16_info.base_addr = 0x4000;
	jrom16_info.addr_width = 14; // 16384 words
	jrom16_info.data_width = 16;
	jrom16_info.readable = true;

[ldoolitt]

Based on reading the following, I think the description added is accurate.

If that's a question for me, yes, that description is accurate.

[mdavidsaver]

If that's a question for me

@ldoolitt Yes it is. (or any similarly knowledgeable person)

, yes, that description is accurate.

Thank you.