Remove doxygen warnings from gblevents

[GeorgeGayno-NOAA]

The module variables are not defined. This is causing warnings when creating the Doxgyen.

gblevents.f:17: warning: Member dlat (variable) of module gblevn_module is not documented.
gblevents.f:17: warning: Member dlon (variable) of module gblevn_module is not documented.
gblevents.f:11: warning: Member iar12z (variable) of module gblevn_module is not documented.
gblevents.f:11: warning: Member iar13p (variable) of module gblevn_module is not documented.
gblevents.f:11: warning: Member iar14t (variable) of module gblevn_module is not documented.
gblevents.f:11: warning: Member iar15u (variable) of module gblevn_module is not documented.
gblevents.f:11: warning: Member iar16v (variable) of module gblevn_module is not documented.
gblevents.f:11: warning: Member iar17q (variable) of module gblevn_module is not documented.
gblevents.f:11: warning: Member iarpsd (variable) of module gblevn_module is not documented.
gblevents.f:11: warning: Member iarpsi (variable) of module gblevn_module is not documented.
gblevents.f:11: warning: Member iarpsl (variable) of module gblevn_module is not documented.
gblevents.f:10: warning: Member idsl (variable) of module gblevn_module is not documented.
gblevents.f:10: warning: Member idvc (variable) of module gblevn_module is not documented.
gblevents.f:9: warning: Member imax (variable) of module gblevn_module is not documented.
gblevents.f:9: warning: Member jmax (variable) of module gblevn_module is not documented.
gblevents.f:9: warning: Member kmax (variable) of module gblevn_module is not documented.
gblevents.f:9: warning: Member kmaxs (variable) of module gblevn_module is not documented.
gblevents.f:10: warning: Member nvcoord (variable) of module gblevn_module is not documented.
gblevents.f:10: warning: Member sfcpress_id (variable) of module gblevn_module is not documented.
gblevents.f:10: warning: Member thermodyn_id (variable) of module gblevn_module is not documented.
gblevents.f:16: warning: Member vcoord (variable) of module gblevn_module is not documented.

Should be a quick fix.

[GeorgeGayno-NOAA]

The Doxygen was built on Hera using 4e3dcf3. All warnings from gblevents.f were gone.

[GeorgeGayno-NOAA]

Here is the Doxygen from the branch:
https://www.emc.ncep.noaa.gov/jcsda/ggayno/doxygen/html/gblevents/gblevents_8f.html

Here is the current Doxygen:
https://ufs-community.github.io/UFS_UTILS/gblevents/gblevents_8f.html

Note the Variables section now contains definitions.