Solutions for 05 history #364

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@craigstanton

Added some solutions to the History chapter, and corrected some typos.

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+> > ## Solution
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+> > 1. Would fetch any changes she doesn't have (i.e. contributed by another user)
@maxim-belkin
maxim-belkin Dec 16, 2016

Two points:

  1. Don't use the word "fetch" here. If students remember this answer exactly, it might become a source of confusion for them in the future.
  2. Your explanation is not correct. git checkout HEAD does nothing because in such a syntax git checkout acts on a HEAD pointer and git checkout HEAD means literally "move HEAD to point to HEAD".
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