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

Typo fix

Author: VesaJuvonen

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

@@ -18,7 +18,7 @@ Client-side web parts support:
 > [!NOTE]
 > Before following the steps in this article, be sure to [Set up your development environment](../../set-up-your-development-environment.md).
 
-You can also follow these steps by watching this video on the Microsoft 365 Platform Communtiy (PnP) YouTube Channel:
+You can also follow these steps by watching this video on the Microsoft 365 Platform Community (PnP) YouTube Channel:
 
 > [!Video https://www.youtube.com/embed/6WTtjXP5yW4]