Fix several typos

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index c930a8f..a85b0a4 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1266,7 +1266,7 @@
  * which is currently hard-coded to be int32_t.
  *
  * Note that this option is meant for internal use only and may be removed
- * without notice. It is incompatible with PSA_USE_PSA_CRYPTO.
+ * without notice. It is incompatible with MBEDTLS_USE_PSA_CRYPTO.
  */
 //#define MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER
 
diff --git a/programs/psa/key_ladder_demo.c b/programs/psa/key_ladder_demo.c
index c36b67f..47d5de6 100644
--- a/programs/psa/key_ladder_demo.c
+++ b/programs/psa/key_ladder_demo.c
@@ -574,7 +574,7 @@
 exit:
     /* Destroy any remaining key. Deinitializing the crypto library would do
      * this anyway since they are volatile keys, but explicitly destroying
-     * keys makes the code easier. */
+     * keys makes the code easier to reuse. */
     (void) psa_destroy_key( derivation_key );
     (void) psa_destroy_key( wrapping_key );
     /* Deinitialize the PSA crypto library. */
diff --git a/tests/suites/test_suite_psa_crypto_slot_management.function b/tests/suites/test_suite_psa_crypto_slot_management.function
index 94bcade..321ce4f 100644
--- a/tests/suites/test_suite_psa_crypto_slot_management.function
+++ b/tests/suites/test_suite_psa_crypto_slot_management.function
@@ -106,7 +106,7 @@
         case INVALIDATE_BY_DESTROYING_WITH_SHUTDOWN:
             PSA_ASSERT( psa_destroy_key( key ) );
             break;
-        /* Purging the key just purge RAM data of persitent keys. */
+        /* Purging the key just purges RAM data of persistent keys. */
         case INVALIDATE_BY_PURGING:
         case INVALIDATE_BY_PURGING_WITH_SHUTDOWN:
             PSA_ASSERT( psa_purge_key( key ) );