[Typo] Quick quiz B.13 typo

[Yubin Ruan <ablacktshirt@xxxxxxxxx>]

perfbook 2017.01.02a:

Quick Quiz B.13:
    Suppose that lines 3-5 for CPUs 1 and 2 in Table B.4 are in an 
interrupt handler, and that the CPU 2's line 9 is run
                                              ~~~~~~~~~
                                              typo here

regards,
Yubin Ruan
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