Fix conditional looping recipe narration to match the example output

[spmallette]

The 'Conditional Looping with Max Depth' recipe described the second example as continuing through a non-existent 'vertex X'. Correct the narration to describe the actual out() traversal from vertex A along the path A->B->C->E, note that vertex G is unreachable so the loop exits on the maximum depth, and state that it returns v[E]. Also fix a 'thorough' to 'through' typo.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.69%. Comparing base (a28cd1f) to head (afd6043).
⚠️ Report is 650 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3684      +/-   ##
============================================
+ Coverage     76.35%   76.69%   +0.33%     
- Complexity    13424    14335     +911     
============================================
  Files          1012     1037      +25     
  Lines         60341    64761    +4420     
  Branches       7075     7695     +620     
============================================
+ Hits          46076    49669    +3593     
- Misses        11548    11999     +451     
- Partials       2717     3093     +376     

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