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Update registers.md

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# Good Information about Registers
- Intel's Architecture Documentation: https://software.intel.com/en-us/articles/intel-sdm
- Refer to Intel's Architecture Documentation for latest information: https://software.intel.com/en-us/articles/intel-sdm
Additional Notes: The x64 architecture extends x86's 8 general-purpose registers to be 64-bit, and adds 8 new 64-bit registers. The 64-bit registers have names beginning with "r", so for example the 64-bit extension of **eax** is called **rax**. The lower 32 bits, 16 bits, and 8 bits of each register are directly addressable in operands. This includes registers, like **esi**, whose lower 8 bits were not previously addressable. The following table specifies the assembly-language names for the lower portions of 64-bit registers.