* Fix typos in the comments in the assembly code for the crypto package.

Change-Id: Iac146a7d8bee4a680a8d4d3af533fbc1b259482d
GitHub-Last-Rev: 65090a38956df4c14bf55df4881c76e8c3d32447
GitHub-Pull-Request: golang/go#25606
Reviewed-on: https://go-review.googlesource.com/114803Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>