The introductory text in doxygen for hci.h and uble.h has relative links back to the BLE-Stack User's Guide. These links are broken and not working on the BLE5-Stack for cc13x2_26x2.

(CC2640R2 may be affected as well). In general we should not link from the doxygen back to the user's guide to prevent broken links like this. Remove the links and just use the text instead

For example from hci.h

 *  @defgroup HCI HCI
 *  @brief This module implements the Host Controller Interface.
 *  For a detailed usage section describing how to send these commands and receive events,
 *  see the <a href="../ble-stack/hci.html">HCI Section</a> of the
 *  User's Guide.

In the text above, <a href="../ble-stack/hci.html">HCI Section</a> should be removed and replaced with "see the HCI section of the user's guide" or something similar.