Update tracing-journald/src/lib.rs

Co-authored-by: Eliza Weisman <[email protected]>

Author: little-dude

tracing-journald/src/lib.rs

@@ -431,7 +431,9 @@ pub enum Priority {
     Debug = b'7',
 }
 
-/// Mappings from the tracing levels to the journald priorities.
+/// Mappings from tracing [`Level`]s to journald [priorities].
+///
+/// [priorities]: Priority
 #[derive(Debug, Clone)]
 pub struct PriorityMappings {
     /// Priority mapped to the `ERROR` level