Fix in README.md to use right request_context syntax as per discussion in the issue. TESTED = all current tests pass

Author: AishwaryaKalloli

README.md

@@ -631,7 +631,7 @@ server = Server("example-server", lifespan=server_lifespan)
 # Access lifespan context in handlers
 @server.call_tool()
 async def query_db(name: str, arguments: dict) -> list:
-    ctx = server.get_context()
+    ctx = server.request_context
     db = ctx.lifespan_context["db"]
     return await db.query(arguments["query"])
 ```