Update build-a-hello-world-web-part.md

Author: patmill

docs/spfx/web-parts/get-started/build-a-hello-world-web-part.md

@@ -222,7 +222,7 @@ Notice that we are performing an HTML escape on the property's value to ensure a
 
 Let's now add a few more properties to the property pane: a check box, a drop-down list, and a toggle. We first start by importing the respective property pane fields from the framework.
 
-1. Scroll to the top of the file and add the following to the import section from `@microsoft/sp-webpart-base`:
+1. Scroll to the top of the file and add the following to the import section from `@microsoft/sp-property-pane`:
 
   ```typescript
   PropertyPaneCheckbox,
@@ -234,13 +234,12 @@ Let's now add a few more properties to the property pane: a check box, a drop-do
 
   ```typescript
   import {
-    BaseClientSideWebPart,
     IPropertyPaneConfiguration,
     PropertyPaneTextField,
     PropertyPaneCheckbox,
     PropertyPaneDropdown,
     PropertyPaneToggle
-  } from '@microsoft/sp-webpart-base';
+  } from '@microsoft/sp-property-pane';
   ```
 
 2. Update the web part properties to include the new properties. This maps the fields to typed objects.
@@ -407,4 +406,4 @@ Congratulations on getting your first Hello World web part running!
 Now that your web part is running, you can continue building out your Hello World web part in the next topic, [Connect your web part to SharePoint](./connect-to-sharepoint.md). You will use the same Hello World web part project and add the ability to interact with SharePoint List REST APIs. Notice that the `gulp serve` command is still running in your console window (or in Visual Studio Code if you are using that as editor). You can continue to let it run while you go to the next article.
 
 > [!NOTE]
-> If you find an issue in the documentation or in the SharePoint Framework, please report that to SharePoint engineering by using the [issue list at the sp-dev-docs repository](https://github.com/SharePoint/sp-dev-docs/issues) or by adding a comment to this article. Thanks for your input in advance.
+> If you find an issue in the documentation or in the SharePoint Framework, please report that to SharePoint engineering by using the [issue list at the sp-dev-docs repository](https://github.com/SharePoint/sp-dev-docs/issues) or by adding a comment to this article. Thanks for your input in advance.