crypto/cipher: update documentation for aead Open
The remaining capacity of dst should not overlap ciphertext.
The previous wording was probably a copy paste mistake from aead Seal.
Change-Id: Iaa28073f9ea90cbe2032c0c1149a78feab6c9239
GitHub-Last-Rev:
fb54bc84c471648eb9d4c56492a8ff6d7db69b2b
GitHub-Pull-Request: golang/go#69108
Reviewed-on: https://go-review.googlesource.com/c/go/+/609075
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>