docs: backtick parameter references in API comments

std/arraylist/arraylist.hon

@@ -10,7 +10,7 @@ ArrayList proc($T type) type {
     }
 }
 
-#! retain allocator for later growth and cleanup; this call does not allocate.
+#! retain `allocator` for later growth and cleanup; this call does not allocate.
 init proc($T type, allocator mem.Allocator) ArrayList(T) {
     return ArrayList(T) {
         items = mem.empty(T),