Update Documentation

docs/wiki/feature/hearing.md

@@ -19,11 +19,14 @@ version:
 Introduces hearing damage caused by nearby explosions and large-caliber weapons.
 
 ### 1.2 Earplugs
-Adds earplugs to mitigate that effect. Soldiers with high caliber weapons or
-missile launchers will be equipped with those, but remember to put them in.
+Adds earplugs to mitigate that effect. Soldiers with high caliber weapons or missile launchers will be automatically equipped with those, but remember to put them in.
+Their drawback is that they reduce the general hearing volume.
 
-### 1.3 Helmets
-Some types of helmets can mitigate hearing damage also (ie. crewman helmet, pilot helmet etc.).
+### 1.3 Active hearing protection
+Some types of helmets/hats with PELTOR-like earmuffs or 2-ear headsets can mitigate hearing damage without dropping the volume.
+
+### 1.4 Crew hearing protection
+Armored vehicle crew and pilot helmets provide the best hearing protection while also dropping general volume, which can be desirable in loud vehicles as most communication happens via intercom or radios.
 
 ## 2. Usage