chore: fix grammar

Co-authored-by: thephez <thephez@users.noreply.github.com>

dip-0013.md

@@ -170,7 +170,7 @@ We define the following levels for them:
 Sub feature is set to `3'`.
 
 If a wallet recovers an unused invitation funding transaction, the wallet should allow the user to
-attempt reuse it.  Dash Platform can be queried to see if the invitation funding transaction 
+attempt reusing it.  Dash Platform can be queried to see if the invitation funding transaction 
 has been used.  It will be up to the user to determine if the invite should be resent to the original 
 recipient or a new recipient.