release 3.9.0 process: reduce warnings (#279)

* fix(riseupvpn): address gofmt warning

Thanks to https://goreportcard.com/report/github.com/ooni/probe-cli.

* fix(utils.go): correct the docu-comment

Thanks to https://goreportcard.com/report/github.com/ooni/probe-cli

* fix: improve spelling

Thanks to https://goreportcard.com/report/github.com/ooni/probe-cli

* fix(modelx_test.go): avoid inefassign warning

Thanks to https://goreportcard.com/report/github.com/ooni/probe-cli

* fix: reduce number of ineffective assignments

Thanks to https://goreportcard.com/report/github.com/ooni/probe-cli

cmd/ooniprobe/internal/utils/utils.go

@@ -39,7 +39,7 @@ func EscapeAwareRuneCountInString(s string) int {
 	return n
 }
 
-// RightPadd adds right padding in from of a string
+// RightPad adds right padding in from of a string
 func RightPad(str string, length int) string {
 	c := length - EscapeAwareRuneCountInString(str)
 	if c < 0 {