pinctrl: dt-binding: fix generic pinmux/pinconf examples

pinconf_generic_dt_node_to_map() scans only subnodes of the pinctrl-0 pahndle,
not the referenced node itself. Change the example nodes to match.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

@@ -137,12 +137,16 @@ groups			- the list of groups to select with this function
 Example:
 
 state_0_node_a {
+	uart0 {
 		function = "uart0";
 		groups = "u0rxtx", "u0rtscts";
+	};
 };
 state_1_node_a {
+	spi0 {
 		function = "spi0";
 		groups = "spi0pins";
+	};
 };
 
 == Generic pin configuration node content ==
@@ -188,16 +192,22 @@ slew-rate		- set the slew rate
 For example:
 
 state_0_node_a {
+	cts_rxd {
 		pins = "GPIO0_AJ5", "GPIO2_AH4"; /* CTS+RXD */
 		bias-pull-up;
+	};
 };
 state_1_node_a {
+	rts_txd {
 		pins = "GPIO1_AJ3", "GPIO3_AH3"; /* RTS+TXD */
 		output-high;
+	};
 };
 state_2_node_a {
+	foo {
 		group = "foo-group";
 		bias-pull-up;
+	};
 };
 
 Some of the generic properties take arguments. For those that do, the