Fix IntoChunks docstring

[romanz]

IIUC, ChunkLazy is no longer used.

[phimuemue]

Looks reasonable, thank you.

Did you grep for other occurrences?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.02%. Comparing base (6814180) to head (94d8bb5).
⚠️ Report is 196 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1100      +/-   ##
==========================================
- Coverage   94.38%   94.02%   -0.37%     
==========================================
  Files          48       51       +3     
  Lines        6665     6631      -34     
==========================================
- Hits         6291     6235      -56     
- Misses        374      396      +22     

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