Update docs/adr/0009-uniffi-tagging.md

Co-authored-by: Jonas Platte <[email protected]>

docs/adr/0009-uniffi-tagging.md

@@ -11,7 +11,7 @@ The code in `uniffi_macros::setup_scaffolding` generates a zero-sized `crate::Un
 For example, when lowering a type we use `<#type as Lower<crate::UniffiTag>>::lower`.
 
 The reason for this is the so-called "Orphan rule", which prevents generated code from implemented a remote trait on a remote type.
-If the FFI traits did not have a generic parameter, then it would be impossible to generate an code that implements those traits for a type defined in another crate.
+If the FFI traits did not have a generic parameter, then it would be impossible to generate code that implements those traits for a type defined in another crate.
 See [ADR-0006 Wrapping types](./0006-wrapping-types.md) for more discussion.
 
 For local types we have a choice: implement only for the local tag (`impl Lift<crate::UniffiTag> for MyType`) or implement it for all tags (`impl<UT> Lift<UT> for MyType)`).