Apply suggestion from @lcnr

Author: lcnr

src/items/generics.md

@@ -311,7 +311,7 @@ struct Foo<#[my_flexible_clone(unbounded)] H> {
 ```
 
 r[items.generics.instantiation]
-When using an item its generic parameters have to get instantiated. This replaces all occurances of the parameter with either the explicitly provided argument or a new unconstrained inference variable.
+When using an item its generic parameters have to get instantiated. This replaces all occurances of the parameter with either the explicitly provided argument or a new inference variable.
 
 Instantiating the generic parameters of an item generally requires proving its where clauses.