Fix some old names that remained

- most in doxygen doc that was never renamed
- some re-introduced in comments/doc/strings by me
diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index a69ba17..b682b9c 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -516,7 +516,7 @@
  *                  R = m * P + n * Q
  *                  (Not thread-safe to use same group in multiple threads)
  *
- * \note            In contrast to ecp_mul(), this function does not guarantee
+ * \note            In contrast to mbedtls_ecp_mul(), this function does not guarantee
  *                  a constant execution flow and timing.
  *
  * \param grp       ECP group