Minor documentation/comment fixes

typos, overlong lines

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/tests/suites/test_suite_cipher.function b/tests/suites/test_suite_cipher.function
index b77d369..47a763c 100644
--- a/tests/suites/test_suite_cipher.function
+++ b/tests/suites/test_suite_cipher.function
@@ -1345,7 +1345,7 @@
      * Authenticate and decrypt, and check result
      */
 
-    /* We can't pass a NULL output buffer to this funciton */
+    /* We can't pass a NULL output buffer to this function */
     ASSERT_ALLOC( decrypt_buf, cipher->len ? cipher->len : 1 );
     outlen = 0;
     ret = mbedtls_cipher_auth_decrypt( &ctx, iv->x, iv->len, ad->x, ad->len,