crypto/cipher: fix typo in example comment

LGTM=josharian
R=golang-codereviews, josharian
CC=golang-codereviews
https://golang.org/cl/110330043

diff --git a/src/pkg/crypto/cipher/example_test.go b/src/pkg/crypto/cipher/example_test.go
index 5677f6f2fe8fdc383e99e377428535dc08a09bfd..1cfa982df4ba4d7de1fa2db172078002ed64a6dc 100644 (file)
--- a/src/pkg/crypto/cipher/example_test.go
+++ b/src/pkg/crypto/cipher/example_test.go
@@ -277,7 +277,7 @@ func ExampleStreamWriter() {
        }
 
        // Note that this example is simplistic in that it omits any
-       // authentication of the encrypted data. It you were actually to use
+       // authentication of the encrypted data. If you were actually to use
        // StreamReader in this manner, an attacker could flip arbitrary bits in
        // the decrypted result.
 }