Clarify documentation on mode ordering

[drhagen]

This was technically incorrect in getting-started.md and could be clarified further in tensors.md.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.24%. Comparing base (87652d6) to head (ccfb64a).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #92   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files          60       60           
  Lines        3126     3126           
  Branches      368      368           
=======================================
  Hits         2821     2821           
  Misses        226      226           
  Partials       79       79           

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