Update error message to use variable name for "children"

src/compiler/checker.ts

@@ -13322,7 +13322,7 @@ namespace ts {
                 const jsxChildrenPropertyName = getJsxElementChildrenPropertyname();
                 if (jsxChildrenPropertyName) {
                     if (attributesTable.has(jsxChildrenPropertyName)) {
-                        error(attributes, Diagnostics.props_children_are_specified_twice_The_attribute_named_children_will_be_overwritten);
+                        error(attributes, Diagnostics._0_are_specified_twice_The_attribute_named_0_will_be_overwritten, jsxChildrenPropertyName);
                     }
 
                     // If there are children in the body of JSX element, create dummy attribute "children" with anyType so that it will pass the attribute checking process

src/compiler/diagnosticMessages.json

@@ -2099,7 +2099,7 @@
         "category": "Error",
         "code": 2707
     },
-    "props.children are specified twice. The attribute named 'children' will be overwritten.": {
+    "'{0}' are specified twice. The attribute named '{0}' will be overwritten.": {
         "category": "Error",
         "code": 2708
     },