Fix "Langeving" typo in sampling.rst

[matsen]

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[rlouf]

Thanks for contributing! Could you rebase your branch on main? There's a commit there fixing the error we're seeing in CI.

[codecov[bot]]

Codecov Report

Merging #331 (df2d54c) into main (8428583) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #331   +/-   ##
=======================================
  Coverage   98.68%   98.68%           
=======================================
  Files          44       44           
  Lines        1894     1894           
=======================================
  Hits         1869     1869           
  Misses         25       25           

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