cmd,crypto/elliptic: fix typos in comments
Replace these incorrect fullwidth brackets with halfwidth brackets.
Change-Id: Ie17561c18334f9c07eedbff79e5f64ed4fc281bd
GitHub-Last-Rev:
94214be6cea75b4d1fa7b536cac523f061614d38
GitHub-Pull-Request: golang/go#66846
Reviewed-on: https://go-review.googlesource.com/c/go/+/579117
Reviewed-by: qiu laidongfeng2 <2645477756@qq.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>