Fix typo in extensions.mdx (#6086)

Author: jnwng

docs/src/token-2022/extensions.mdx

@@ -1615,7 +1615,7 @@ await updateTransferHook(
   </TabItem>
 </Tabs>
 
-#### Example: Manage a transfer-hook programa
+#### Example: Manage a transfer-hook program
 
 A sample CLI for managing a transfer-hook program exists at
 [spl-transfer-hook-cli](https://github.com/solana-labs/solana-program-library/tree/master/token/transfer-hook/cli).
@@ -1917,4 +1917,4 @@ Signature: 2H16XtBqdwSbvvq8g5o2jhy4TknP6zgt71KHawEdyPvNuvusQrV4dPccUrMqjFeNTbk75
 Coming soon!
 
   </TabItem>
-</Tabs>
+</Tabs>