Ignore omitted json fields from docs

[inoda]

Is your feature request related to a problem? Please describe. I have a struct:

type RevenueMetricsTimeline struct {
    PrevPeriodUpperLimit    int64                     `json:"start"`
    CurrentPeriodUpperLimit int64                     `json:"end"`
    AllMetrisUpperLimit     int64                     `json:"-"`
}

The generated docs show "allMetrisUpperLimit" even though when converting this struct to json AllMetrisUpperLimit will be dropped.

Describe the solution you'd like Honor json encoding tags and omit fields with json:"-" from the documentation

Describe alternatives you've considered I could manually override the generated documentation, or write a script to do it, or create another struct just for documentation purposes.

[pei0804]

We already support this case. https://github.com/swaggo/swag/blob/master/testdata/simple/web/handler.go#L31