Here are some descriptions about hotkeys.ini, hope this is what you meant by description
Hotkeysreloads1=rThis hotkey allows you to reload without changing weapon mode to RELOAD. So you can keep your weapon on BURST for example and still reload. This hotkey will reload your active weapon (slot 1).
reloads2=lshift rThis hotkey allows you to reload without changing weapon mode to RELOAD. So you can keep your weapon on BURST for example and still reload. This hotkey will reload your secondary weapon (slot 2).
use_util=eThis hotkey allows you to use any item from your utility slot, like grenades or medikits. By hitting the hotkey, you might get a different cursor, depending on what is on your utility slot. For example, a grenade will change the cursor to the grenade cursor so you can aim.
first_aid=lshift 5This hotkey allows you to use first aid skill on yourself, so you do not have to target yourself and click to activate the skill.
doctor=lshift 6This hotkey allows you to use doctor skill on yourself, so you do not have to target yourself and click to activate the skill.