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Doc: Clarify opcode mnemonic for 16-bit address registers 

When you see a 16-bit register wrapped by parentheses, its referencing
the value at the address the register is pointing to rather than the
address itself.
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Riyyi 2 years ago
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      doc/terminology.org

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@ -36,7 +36,7 @@ We start counting from the right as bit *#0*!
| register | 8 | unsigned | r8 | | r8 | r | | Any of the registers | |
| register | 16 | unsigned | r16 | | r16 | rr | | Any of the registers | little-endian |
| address | 8 | unsigned | a8 | | | (n) | | Address at value | |
| address | 16 | unsigned | a16 | a16 | n16 | (nn) | nn | Address at value | little-endian |
| address | 16 | unsigned | a16 or () | a16 | n16 | (nn) | nn | Address at value | little-endian |
| immediate | 8 | signed | s8 | r8 | e8 | e | dd | Next byte in memory | |
| immediate | 8 | unsigned | io8 | (a8) | n16 | (n) | n | 0xff00 + next byte in memory | write to I/O-port |
| condition | | | <ZNHC> | NZ | cc | | f | Execute if condition met | |

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