docs: Update migration_guide.md

docs/book/src/migration_guide.md

@@ -90,7 +90,7 @@ and API docs for the macros `define_property!`, `impl_property!`,
 | Concept                     | Old System                                                                                                                     | New System                                                                                                           | Notes / Implications                                                                |
 | --------------------------- | ------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------- |
 | **Property Type Structure** | Two separate types: (1) value type, and (2) property-identifier ZST.                                                           | A single type represents both the value and identifies the property.                                                 | Simplified to a single type                                                         |
-| **Defining Properties**     | Define a normal Rust type (or use an existing primitive, e.g. `u8`), then use a macro to define the identifying property type. | Define a normal Rust type, them use `impl_property` to declare it a `Property<E>` for a particular `Entity` `E`.     |                                                                                     |
+| **Defining Properties**     | Define a normal Rust type (or use an existing primitive, e.g. `u8`), then use a macro to define the identifying property type. | Define a normal Rust type, then use `impl_property` to declare it a `Property<E>` for a particular `Entity` `E`.     |                                                                                     |
 | **Entity Association**      | Implicit—only one entity ("person")                                                                                            | Every property must explicitly specify the `Entity` it belongs to (e.g., `Person`); Entities are defined separately. |                                                                                     |
 | **Default Values**          | Provided in the macro creating the property-identifier type.                                                                   | Same but with updated syntax; default values are per `Property<E>` implementation.                                   |                                                                                     |
 | **Using Existing Types**    | A single _value_ type can be used in multiple properties—including primitive types like `u8`                                   | Only one property per type (per `Entity`); primitive types must be wrapped in a newtype.                             | Both systems require that the existing type implement the required property traits. |