Fixed typo from "HellowWorld" to "HelloWorld"

## Category

- [x] Content fix
- [ ] New article

## What's in this Pull Request?

a) Fixed typo from "HellowWorld" to "HelloWorld"

Author: vijayysisodia

docs/spfx/web-parts/basics/integrate-with-property-pane.md

@@ -106,7 +106,7 @@ This is then available in your web part by using `this.properties.targetProperty
 <p class="ms-font-l ms-fontColor-white">${escape(this.properties.targetProperty)}</p>
 ```
 
-When the properties are defined, you can access them in your web part by using the `this.properties.[property-name]`. For more information, see [Build a HellowWorld web part: Web part render() method](../get-started/build-a-hello-world-web-part.md#web-part-render-method).
+When the properties are defined, you can access them in your web part by using the `this.properties.[property-name]`. For more information, see [Build a HelloWorld web part: Web part render() method](../get-started/build-a-hello-world-web-part.md#web-part-render-method).
 
 ## Handle field changes