[docs] Update sample snippet with a suggestion from Copilot.

Ref: dotnet/docs-mobile#94 (review)

Author: rolfbjarne

docs/building-apps/build-properties.md

@@ -1169,7 +1169,7 @@ This will pass `-W` to `open` if set to `true`.
 Example:
 
 ```shell
-$ dotnet run -p:OpenWaitForExit=false
+$ dotnet run -p:OpenWaitForExit=true
 ```
 
 ### OpenArguments