Core/packets: fixed a typo in health frequent packet class name

src/server/game/Server/Packets/MiscPackets.cpp

@@ -225,8 +225,7 @@ WorldPacket const* WorldPackets::Misc::SetMovementAnimKit::Write()
     return &_worldPacket;
 }
 
-
-WorldPacket const* WorldPackets::Misc::UnitHealthFrquent::Write()
+WorldPacket const* WorldPackets::Misc::UnitHealthFrequent::Write()
 {
     _worldPacket << UnitGUID.WriteAsPacked();
     _worldPacket << int32(Health);