Several fixes to the docs

[ghost]

• Capitalize chapter 2 headings
• Correct behavior of control regs in user mode, fixes #21 (I'm not a native speaker. Please review.)
• Fix references to another part of the docs
• Correct retrieved datetime data pattern
  • Year is 7 8 bit in the bit field
  • I'm not sure if value in R3:
    • should be 16-bit tick (0 - 65535) or 12-bit milliseconds (0-999)
    • if it's tick, is it in milliseconds or clock tick interval, and since epoch start or when the interval is set?
• Correct JMI bit pattern description
  • Remove references to a non-existing operand.
• Correct NZCV tests for BUG/BSG
  • They branch when Rx != M, so Z flag should be 0.