Clarify evaluation function docs

[Balandat]

No description provided.

[facebook-github-bot]

@Balandat has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[codecov-commenter]

Codecov Report

Merging #606 (af36568) into master (3d20dc0) will not change coverage.
The diff coverage is n/a.

❗ Current head af36568 differs from pull request most recent head 831cc8b. Consider uploading reports for the commit 831cc8b to get more accurate results

@@           Coverage Diff           @@
##           master     #606   +/-   ##
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  Coverage   93.81%   93.81%           
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  Files         345      345           
  Lines       27154    27154           
=======================================
  Hits        25475    25475           
  Misses       1679     1679           

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[facebook-github-bot]

@Balandat merged this pull request in bf8181b.