net/url: fix typo in method Redacted()

[starius]

What version of Go are you using (go version)?

$ go version

1.20.5

Does this issue reproduce with the latest release?

Yes

What did you do?

Open https://pkg.go.dev/net/url#URL.Redacted
It says "Only the password in u.URL is redacted."
Should be "Only the password in u.User is redacted."

[ianlancetaylor]

Thanks.

[gopherbot]

Change https://go.dev/cl/502355 mentions this issue: net/url: correct field name in Redacted doc comment