docs: clarify access URL in install flow (#5626)

* fix: TLS disabled copy

* clarify default access URL

* add docs for coder address

cli/server_test.go

@@ -742,7 +742,7 @@ func TestServer(t *testing.T) {
 		)
 		err := root.ExecuteContext(ctx)
 		require.Error(t, err)
-		require.ErrorContains(t, err, "either HTTP or TLS must be enabled")
+		require.ErrorContains(t, err, "TLS is disabled. Enable with --tls-enable or specify a HTTP address")
 	})
 
 	t.Run("NoTLSAddress", func(t *testing.T) {