[REST] Fix version number in YAML examples (#4978)

Signed-off-by: Laurent Garnier <lg.hc@free.fr>

Author: lolodomo

bundles/org.openhab.core.io.rest.core/src/main/java/org/openhab/core/io/rest/core/internal/fileformat/FileFormatResource.java

@@ -119,7 +119,7 @@ public class FileFormatResource implements RESTResource {
             """;
 
     private static final String YAML_THINGS_EXAMPLE = """
-            version: 2
+            version: 1
             things:
               binding:typeBridge:idBridge:
                 isBridge: true
@@ -143,7 +143,7 @@ public class FileFormatResource implements RESTResource {
             """;
 
     private static final String YAML_ITEMS_EXAMPLE = """
-            version: 2
+            version: 1
             items:
               Group1:
                 type: Group