crypto/des: fix typo in permuteInitialBlock function comments
crypto/des: fix typo in permuteInitialBlock function comments

Fixes #41398

Change-Id: Ib47b8ec43bb11d8cd13c24f833532434127c7532
Reviewed-on: https://go-review.googlesource.com/c/go/+/254980
Reviewed-by: Roland Shoemaker <0d270388f2f92757a5de0f4bd891d3b392c44c4f@golang.org>
Trust: Roland Shoemaker <0d270388f2f92757a5de0f4bd891d3b392c44c4f@golang.org>
Trust: Katie Hockman <e321a8fd89c4908465ddaf8d5d0d62480efacb63@golang.org>
Run-TryBot: Roland Shoemaker <0d270388f2f92757a5de0f4bd891d3b392c44c4f@golang.org>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

CAFxX/go,golang/go,nawawi/go,cloudflare/go,CAFxX/go,nawawi/go,golang/go,CAFxX/go,golang/go,golang/go,golang/go,nawawi/go,cloudflare/go,cloudflare/go,cloudflare/go,nawawi/go,golang/go,cloudflare/go,CAFxX/go,cloudflare/go,CAFxX/go,CAFxX/go,golang/go,nawawi/go,golang/go,cloudflare/go,nawawi/go,CAFxX/go,nawawi/go,CAFxX/go,nawawi/go,cloudflare/go