Spelling corrections for Hello World part 3 (SharePoint#3715)

Just updated the code sample to reference "helloworld" instead of "helloword".

Author: PopWarner

docs/spfx/web-parts/get-started/serve-your-web-part-in-a-sharepoint-page.md

@@ -42,13 +42,13 @@ You can also follow these steps by watching this video on the SharePoint PnP You
   {
     "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/package-solution.schema.json",
     "solution": {
-      "name": "helloword-webpart-client-side-solution",
+      "name": "helloworld-webpart-client-side-solution",
       "id": "3c1af394-bbf0-473c-bb7d-0798f0587cb7",
       "version": "1.0.0.0",
       "includeClientSideAssets": true
     },
     "paths": {
-      "zippedPackage": "solution/helloword-webpart.sppkg"
+      "zippedPackage": "solution/helloworld-webpart.sppkg"
     }
   }
   ```
@@ -187,4 +187,4 @@ You should see the **HelloWorld** web part you built in the previous article tha
 You can continue building out your Hello World web part in the next topic [Hosting client-side web part from Office 365 CDN](./hosting-webpart-from-office-365-cdn.md), where you will learn how to deploy and load the web part assets from an Office 365 CDN instead of localhost, which means that you are preparing this solution for shipping or using it in production environment.
 
 > [!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.