Fix Suppress typo (#4016)

* Fix typo

* Update package.json

* Update assets.ts

Author: Youssef1313

package.json

@@ -633,7 +633,7 @@
           "default": false,
           "description": "Suppress the warning that project.json is no longer a supported project format for .NET Core applications"
         },
-        "csharp.supressBuildAssetsNotification": {
+        "csharp.suppressBuildAssetsNotification": {
           "type": "boolean",
           "default": false,
           "description": "Suppress the notification window to add missing assets to build or debug the application."