Rollup merge of #40621 - jswalden:dependant-spelling-fix, r=sfackler

Fix a spelling error in HashMap documentation, and slightly reword surrounding text for precision

Noticed while reading docs just now.

It's possible that the prior wording *meant* to state that the seed's randomness depends on the exact instant that the system RNG was created, I guess.  But unless there's an API guarantee that this is the case, the wording seems over-precise.  Is there a formal API guarantee that would forbid, say, the system RNG from generating all output using the Intel RDRAND instruction?  I don't think the quality of output in that case would depend on when the RNG was created.  Yet it seems to me like it could well be a valid source of randomness when computing the initial seed.

For that reason, tying the randomness of the seed, to the quality of the RNG's output *at the precise instant the seed is computed*, seems less confining.  That instantaneous quality level could be determined by the quality at the instant the RNG was created -- but instantaneous quality need not be low for that precise reason.

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