rename LivingEntity setCurrentHand -> tryStartUsing and add javadoc

Co-authored-by: ix0rai <[email protected]>

mappings/net/minecraft/entity/LivingEntity.mapping

@@ -120,7 +120,10 @@ CLASS net/minecraft/unmapped/C_usxaxydn net/minecraft/entity/LivingEntity
 	METHOD m_awmtskvv getMovementSpeed (F)F
 		ARG 1 slipperiness
 	METHOD m_axkhmdzu getDeathSound ()Lnet/minecraft/unmapped/C_avavozay;
-	METHOD m_ayeajhdm setCurrentHand (Lnet/minecraft/unmapped/C_laxmzoqs;)V
+	METHOD m_ayeajhdm tryStartUsing (Lnet/minecraft/unmapped/C_laxmzoqs;)V
+		COMMENT If the passed {@link net.minecraft.util.Hand hand} holds an
+		COMMENT {@link net.minecraft.item.ItemStack item} and one is not already being used,
+		COMMENT starts using the held {@link net.minecraft.item.ItemStack item}.
 		ARG 1 hand
 	METHOD m_bftuqrdn onKilledBy (Lnet/minecraft/unmapped/C_usxaxydn;)V
 		COMMENT Performs secondary effects after this mob has been killed.