[davidbudzynski]

Summary

• Rewrote the psort(), charToFact(), vswitch()/nswitch(), psum() family, and topn() help pages in short, plain sentences.
• Documented nThread = getOption("kit.nThread"), locale and encoding behavior, the psort() non-character fallback, and R's real long-vector limits (2^52 on 64-bit builds).
• Split the topn() output documentation into short paragraphs and documented the actual fallback and long-vector memory behavior.

Closes #91.

Checks

• tools::checkRd() passes for all five changed files.
• git diff --check passes.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.76%. Comparing base (99413b6) to head (22abcd3).
⚠️ Report is 128 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
- Coverage   98.01%   96.76%   -1.25%     
==========================================
  Files          13       14       +1     
  Lines        5083     5136      +53     
==========================================
- Hits         4982     4970      -12     
- Misses        101      166      +65     

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