doc: [Transfer] basic demo codes issue (#1112)

* fix transfer basic demo issue

* typo

Author: Realank

components/transfer/demo/basic.md

@@ -23,7 +23,7 @@ The most basic usage of `Transfer` involves providing the source data and target
       :disabled="disabled"
     />
     <a-switch
-      unCheckedChildren="disabled"
+      unCheckedChildren="enabled"
       checkedChildren="disabled"
       :checked="disabled"
       @change="handleDisable"