option set: statements with a name replace only that one; forwarding over TLS documented

jarl option set tls NAME (and key, remote-servers, primaries, http, dnssec-policy, key-store, server, acl, view, zone, parental-agents) matches the name after the keyword too: setting tls cloudflare no longer replaces tls quad9. jarl option unset tls NAME removes one by its name. docs/encrypted-dns.md has forwarding to Quad9 or Cloudflare over TLS: one changeset, the options explained, several providers, checking it works, and why not over HTTPS.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

cmd/jarl/main_test.go

@@ -232,3 +232,20 @@ func TestOutputFields(t *testing.T) {
 		}
 	}
 }
+
+func TestOptionLabel(t *testing.T) {
+	for _, c := range []struct{ name, value, want string }{
+		{"tls", `quad9 { remote-hostname "dns.quad9.net"; }`, "quad9"},
+		{"tls", `Cloudflare{ remote-hostname "cloudflare-dns.com"; }`, "cloudflare"},
+		{"key", `"xfer key" { algorithm hmac-sha256; secret "x"; }`, "xfer key"},
+		{"server", "192.0.2.1 { keys { xfer; }; }", "192.0.2.1"},
+		{"remote-servers", "secondaries { 192.0.2.53; }", "secondaries"},
+		{"forwarders", "{ 9.9.9.9; }", ""},
+		{"logging", "{ channel x { stderr; }; }", ""},
+		{"tls", "", ""},
+	} {
+		if got := optionLabel(c.name, c.value); got != c.want {
+			t.Errorf("optionLabel(%q, %q) = %q, want %q", c.name, c.value, got, c.want)
+		}
+	}
+}