net/http/cookiejar: remove duplicate words from comments
net/http/cookiejar: remove duplicate words from comments

Change-Id: Id44f587199683fd8018865af1c2442f9f74e0dad
GitHub-Last-Rev: 35b1ab88677586c79918d363f22e05bc0c3c6479
GitHub-Pull-Request: golang/go#54495
Reviewed-on: https://go-review.googlesource.com/c/go/+/424434
Reviewed-by: hopehook <63023fcaeafd0730eb709923fc3c0482e6977249@qq.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Damien Neil <7e091e9a80da888fcd7836fd3c6b7b85f4677c12@google.com>
Run-TryBot: hopehook <63023fcaeafd0730eb709923fc3c0482e6977249@qq.com>
Reviewed-by: Joedian Reid <454f26308bdf67a957daa60c4ad294a9b7c3fcbc@golang.org>

golang/go,golang/go,golang/go,golang/go,golang/go,golang/go,golang/go,golang/go