cmd/doc: go doc struct.field prints non-Go syntax

[rsc]

$ go doc http.Client.Jar
struct Client {
    // Jar specifies the cookie jar.
    //
    // The Jar is used to insert relevant cookies into every
    // outbound Request and is updated with the cookie values
    // of every inbound Response. The Jar is consulted for every
    // redirect that the Client follows.
    //
    // If Jar is nil, cookies are only sent if they are explicitly
    // set on the Request.
    Jar CookieJar
}
$ 

In general go doc prints Go or pseudo-Go output. struct Client is not Go, it's C.

It would also be nice to print ... other fields elided ... on a line before the closing brace, to make clear that there are other fields in the type.

/cc @robpike

[gopherbot]

CL https://golang.org/cl/47730 mentions this issue.