Fix typo in comment

Fix typo in program/pkey/ecdh_curve25519.c

Signed-off-by: HowJMay <vulxj0j8j8@gmail.com>
diff --git a/programs/pkey/ecdh_curve25519.c b/programs/pkey/ecdh_curve25519.c
index e79dce0..5febc68 100644
--- a/programs/pkey/ecdh_curve25519.c
+++ b/programs/pkey/ecdh_curve25519.c
@@ -88,7 +88,7 @@
     mbedtls_printf( " ok\n" );
 
     /*
-     * Client: inialize context and generate keypair
+     * Client: initialize context and generate keypair
      */
     mbedtls_printf( "  . Setting up client context..." );
     fflush( stdout );