fix some typos and add some examples that panic

[Takashiidobe]

Fixed a few typos I noticed and added a panicking example for zip_eq and one for chunks.

[phimuemue]

Thanks for this!

[phimuemue]

Can you address the CI issues?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.75%. Comparing base (6814180) to head (04e0054).
⚠️ Report is 164 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1063      +/-   ##
==========================================
- Coverage   94.38%   93.75%   -0.63%     
==========================================
  Files          48       50       +2     
  Lines        6665     6297     -368     
==========================================
- Hits         6291     5904     -387     
- Misses        374      393      +19     

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