fix parent claiming plurality
@@ -121,7 +121,7 @@ relationship can be expressed in one of two ways:
automatically joined by members of the space: see
[below](#auto-joined-children).
- 2. Separately, rooms can claim parents via the `m.room.parent` state
+ 2. Separately, rooms can claim a parent via the `m.room.parent` state
event:
```js
