add note for overlapping lists

[oriongonza]

#645

[Mingun]

I slightly updated PR, added a reference to the feature that was possible after merging #649. If all wording are correct, it can be merged. @dralley , are you willing to check?

[codecov-commenter]

Codecov Report

Merging #647 (d6d8abd) into master (7866cf1) will increase coverage by 0.04%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##           master     #647      +/-   ##
==========================================
+ Coverage   64.47%   64.51%   +0.04%     
==========================================
  Files          36       36              
  Lines       17315    17286      -29     
==========================================
- Hits        11163    11152      -11     
+ Misses       6152     6134      -18     

Flag	Coverage Δ
unittests	64.51% <0.00%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/de/mod.rs	69.41% <0.00%> (+0.37%)	⬆️

[dralley]

It's fine. It's phrased a little weirdly but it's perfectly understandable. I've stopped trying to point out every little grammar glitch because it's just not a big deal anyway.