Hook up TextControlWithAffixes to state for interactivity.

plugins/woocommerce-admin/packages/components/src/text-control-with-affixes/example.md

@@ -1,21 +1,31 @@
 ```jsx
 import { TextControlWithAffixes } from '@woocommerce/components';
 
-const MyTextControlWithAffixes = () => (
+const MyTextControlWithAffixes = withState( {
+	first: '',
+    second: '',
+    third: '',
+} )( ( { first, second, third, setState } ) => (
     <div>
         <TextControlWithAffixes
             prefix="Prefix"
             placeholder="Placeholder text..."
+            value={ first }
+            onChange={ value => setState( { first: value } ) }
         />
         <TextControlWithAffixes
             prefix="Prefix"
             suffix="Suffix"
             placeholder="Placeholder text..."
+            value={ second }
+            onChange={ value => setState( { second: value } ) }
         />
         <TextControlWithAffixes
             suffix="Suffix"
             placeholder="Placeholder text..."
+            value={ third }
+            onChange={ value => setState( { third: value } ) }
         />
     </div>
-);
+) );
 ```