Fix typos prior to release

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/library/psa_crypto_se.h b/library/psa_crypto_se.h
index 7104261..6d965ee 100644
--- a/library/psa_crypto_se.h
+++ b/library/psa_crypto_se.h
@@ -143,7 +143,7 @@
     psa_se_drv_table_entry_t *driver,
     psa_key_slot_number_t *slot_number );
 
-/** Destoy a key in a secure element.
+/** Destroy a key in a secure element.
  *
  * This function calls the relevant driver method to destroy a key
  * and updates the driver's persistent data.