Merge branch 'anoa/rebind_3pids' of github.com:matrix-org/matrix-doc into anoa/rebind_3pids

proposals/2229-rebind-existing-3pid.md

@@ -43,7 +43,7 @@ choose to bind that email to an identity server at the same time. This is
 specified through a `bind` boolean. If the user first adds the 3PID with
 `bind: false`, then decides they want to bind that 3PID to an identity server
 to make themselves discoverable by it, by making another request with `bind:
-true`. The homeserver will reject the second request, because this 3PID is
+true`, the homeserver will reject the second request, because this 3PID is
 already tied to the user's account.
 
 Similarly, when a user initially sends their 3PID with `bind: true` through a
@@ -62,7 +62,7 @@ and [`POST
 endpoints by extending the definition of what homeservers should check before
 rejecting a bind.
 
-Homeservers should reject the binding of a 3PID if it already been bound,
+Homeservers should reject the binding of a 3PID if it has already been bound,
 **unless** the requesting user is the one who originally bound that 3PID. If
 so, then they should be able to bind it again and again if they so choose.