Update apps/portal/src/app/vault/security/page.mdx

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>
Signed-off-by: samina <[email protected]>

Author: saminacodes

apps/portal/src/app/vault/security/page.mdx

@@ -83,7 +83,7 @@ The client generates the `ciphertext` using xChaCha20Poly1305 with the random no
 
 The generated ciphertext, nonce, and the public key to the ephemeral secret are all hex encoded and sent as the payload
 
-## Decrypting the Resposne
+## Decrypting the Response
 
 The response also arrives in the same payload format. We just perform the steps in reverse now.