ASoC: dt-bindings: audio-graph-card2: Drop incomplete example

The example in audio-graph-card2 binding is incomplete, uses
undocumented compatibles strings, and doesn't follow typical .dts
formatting. Rather than try to fix with what would probably be a lengthy
example, just drop the example.
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230707221725.1071292-1-robh@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/audio-graph-card2.yaml

@@ -39,22 +39,4 @@ required:
 
 additionalProperties: false
 
-examples:
-  - |
-    sound {
-        compatible = "audio-graph-card2";
-
-        links = <&cpu_port>;
-    };
-
-    cpu {
-        compatible = "cpu-driver";
-
-        cpu_port: port { cpu_ep: endpoint { remote-endpoint = <&codec_ep>; }; };
-    };
-
-    codec {
-        compatible = "codec-driver";
-
-        port { codec_ep: endpoint { remote-endpoint = <&cpu_ep>; }; };
-    };
+...