[docs] syntax errors in "Error and panic handling"

[brasic]

I noticed that the code examples at https://riverqueue.com/docs/error-handling include some syntax errors, possibly from a past find-and-replace operation. The job param is listed in three places as being type *river.rivertype.JobRow which is not legal syntax.

func (*CustomErrorHandler) HandleError(ctx context.Context, job *river.rivertype.JobRow, err error) *river.ErrorHandlerResult {
    fmt.Printf("Job errored with: %s\n", err)
    return nil
}

 ./prog.go:6:81: syntax error: unexpected . in parameter list; possibly missing comma or )

[brandur]

Thanks @brasic! Quite right. I just pushed up a fix to correct these.

[brasic]

@brandur cheers! FYI that it looks like the example is still not usable as-is since the interface gained a trace param for HandlePanic in #423.

[brandur]

Thanks again. Just updated those signatures as well.