doxygen warning expected <TR> tag and illegal command

[avan989]

Describe the bug
/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/inc/cfe_es.h:562: warning: expected tag but found TK_LNKWORD token instead!
/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/inc/cfe_es.h:562: warning: expected tag but found TK_LNKWORD token instead!
/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/sb/cfe_sb_priv.h:480: warning: expected tag but found TK_LNKWORD token instead!
/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/sb/cfe_sb_priv.h:493: warning: expected tag but found TK_LNKWORD token instead!
/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/sb/cfe_sb_priv.h:505: warning: expected tag but found TK_LNKWORD token instead!
/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/sb/cfe_sb_priv.h:522: warning: expected tag but found TK_LNKWORD token instead!
/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/sb/cfe_sb_priv.h:563: warning: expected tag but found TK_LNKWORD token instead!
/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/sb/cfe_sb_priv.h:534: warning: expected tag but found TK_LNKWORD token instead!
/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/sb/cfe_sb_priv.h:546: warning: expected tag but found TK_LNKWORD token instead!

/media/sf_share/cfs_11_5_2019/cfs/cfe/fsw/cfe-core/src/inc/cfe_sb_msg.h:560: warning: Illegal command \SB_PIPEOPTSEC as the argument of a \c command

To Reproduce
Steps to reproduce the behavior:

1. make usersguide

System observed on:

• Hardware
• Ubuntu 18.04
• doxygen 1.8.13

Reporter Info
Anh Van, NASA Goddard