Update callbacks.mdx

Author: PixelPil0t1

src/pages/ibc/extensions/callbacks.mdx

@@ -18,7 +18,7 @@ To solve this problem, the [ADR-8 specification][adr-8] was created. On the sour
 provides callbacks when an IBC packet was acknowledged or timed out. On the destination chain, it
 triggers callbacks when a packet is received.
 
-IBC Callbacks is a generalized successor of [IBC Hooks][ibc-hooks] that works not just for ICS20
+IBC Callbacks are a generalized successor of [IBC Hooks][ibc-hooks] that works not just for ICS20
 transfers, but any message that supports the required interface.
 
 [packet-lifecycle]: ../diy-protocol/packet-lifecycle