fix import typo #2

Author: snowystinger

packages/dev/docs/pages/blog/building-a-numberfield.mdx

@@ -9,7 +9,7 @@ governing permissions and limitations under the License. -->
 
 
 import {BlogPostLayout, Video, Image} from '@react-spectrum/docs';
-import pinyinEntering from 'url:../assets/Numberfield-pinyin.mp4';
+import pinyinEntering from 'url:../assets/NumberField-pinyin.mp4';
 import numberfieldExample from 'url:../assets/NumberField-example.png';
 import numberfieldIphoneDefault from 'url:../assets/NumberField_Iphone_default.png';
 import numberfieldIphonePositive from 'url:../assets/NumberField_Iphone_positive.png';