Lua API documentation cleanup

also reduces amount of headings with only a single entry

SendAirStrike() - now listed under "Support Powers"
Guard() - now listed under "Combat"
FindResources() - now listed under "Movement"
Deploy() - now listed under "General"
SendParaTroopers() - now listed under "Support Powers"
Paradrop() - no listed under "Transports"

Teleport() should probably be listd under "Movement", but I don't know how to change that (currently listed under "General").

note that I changed "ScriptGlobal" to "ScriptPropertyGroup" for SendAirStrike() - I hope that does not screw up anything

OpenRA.Mods.RA/Scripting/Properties/ParadropProperties.cs

@@ -15,7 +15,7 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA.Scripting
 {
-	[ScriptPropertyGroup("Paradrop")]
+	[ScriptPropertyGroup("Transports")]
 	public class ParadropProperties : ScriptActorProperties, Requires<CargoInfo>, Requires<ParaDropInfo>
 	{
 		readonly ParaDrop paradrop;

OpenRA.Mods.RA/Scripting/Properties/ParatroopersProperties.cs

@@ -15,7 +15,7 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA.Scripting
 {
-	[ScriptPropertyGroup("Paratroopers")]
+	[ScriptPropertyGroup("Support Powers")]
 	public class ParatroopersProperties : ScriptActorProperties, Requires<ParatroopersPowerInfo>
 	{
 		readonly ParatroopersPower pp;