fix empty docs clippy warning

packages/hooks/src/use_root_context.rs

@@ -1,6 +1,6 @@
 use dioxus_core::{prelude::provide_root_context, prelude::try_consume_context, use_hook};
 
-///
+/// Try to get a value from the root of the virtual dom, if it doesn't exist, create a new one with the closure provided.
 pub fn use_root_context<T: 'static + Clone>(new: impl FnOnce() -> T) -> T {
     use_hook(|| {
         try_consume_context::<T>()