Fix Yarp basic-demo project link

Author: burhansavci

projects/yarp/Readme.md

@@ -3,8 +3,8 @@ YARP Reverse Proxy
 
 This section showcases demoes on creating reverse proxy using YARP.
 
-* [Basic Demo](projects/net6/yarp/basic-demo)
+* [Basic Demo](/projects/yarp/basic-demo)
 
     Basic demo showcasing simple routing.
 
-dotnet6
+dotnet6