Update ecdsa.h

minor fix based on review comments
diff --git a/include/mbedtls/ecdsa.h b/include/mbedtls/ecdsa.h
index 806c417..11df7e2 100644
--- a/include/mbedtls/ecdsa.h
+++ b/include/mbedtls/ecdsa.h
@@ -238,7 +238,8 @@
  *
  * \see             ecp.h
  *
- * \deprecated      Superseded by mbedtls_ecdsa_write_signature() in 2.0.0
+ * \deprecated      Superseded by mbedtls_ecdsa_write_signature() in
+ *                  Mbed TLS version 2.0 and later.
  *
  * \param ctx       The ECDSA context.
  * \param hash      The message hash.