Minor: Fix typos in program comments
Fix a couple of typos and writer's mistakes,
in some reference program applications
diff --git a/programs/pkey/ecdh_curve25519.c b/programs/pkey/ecdh_curve25519.c
index aa15c46..e7ead9a 100644
--- a/programs/pkey/ecdh_curve25519.c
+++ b/programs/pkey/ecdh_curve25519.c
@@ -204,7 +204,7 @@
mbedtls_printf( " ok\n" );
/*
- * Verification: are the computed secret equal?
+ * Verification: are the computed secrets equal?
*/
mbedtls_printf( " . Checking if both computed secrets are equal..." );
fflush( stdout );