Update Chapter 6's vestigial "previous chapter" references to Chapter 4 #478
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Chapters 4 & 5 were swapped so chapter 6's references to code in chapter 4 as "the previous chapter" are incorrect.
Please note there alternative corrections possible for "the previous chapter" such as:
Could be used, so feedback on this is welcome. I feel like the second "the previous chapter" instance could be replaced with something other than 'chapter 4'
The changes here seemed relatively unambiguous, though.