Update traits.jl

Author: mortenpi

src/traits.jl

@@ -6,7 +6,7 @@
 A trait which indicates whether a tree node stores references to its parents (`StoredParents()`) or
 if the parents must be inferred from the tree structure (`ImplicitParents()`).
 
-Trees for which `parentlinks` returns `StoredParents()` *MUST* implement [`parent`](@ref).
+Trees for which `ParentLinks` returns `StoredParents()` *MUST* implement [`parent`](@ref).
 
 If `StoredParents()`, all nodes in the tree must also have `StoredParents()`, otherwise use
 `ImplicitParents()`.