Ralf Jung 92f3f0830f
Rollup merge of #84878 - jimblandy:contains-doc-fix, r=joshtriplett
Clarify documentation for `[T]::contains`

Change the documentation to correctly characterize when the suggested alternative to `contains` applies, and correctly explain why it works.

Fixes #84877
2021-05-05 17:52:26 +02:00
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