Fix Typos

[j0106223]

Chapter 3.1.4 Interrupts and exceptions, on page 12 contains the typo of "occured"; it should be corrected to "occurred"

The decoder generally does not know where an interrupt "occured" in the instruction sequence,

Chapter 9 Reference Compressed Branch Trace Algorithm , on page 51 contains the typo of "occured"; it should be corrected to "occurred"

Reported? "Exception previous" reported with thaddr = 0 on the cycle it "occured" because it was
preceded by an updiscon or immediately followed by another exception;

Chapter 4.1.2 Relationship between RISC-V core and the encoder, on page 19 contains the typo of "singe"; it should be corrected to "single"

Implement a "singe" interface for the core, with muxing inside the core to select which hart to
connect to the interface.