Correction for comment and indents as spaces

FGData/AI/Aircraft/Aerotow/C-47/Sound/sound.xml

@@ -6,10 +6,10 @@
             <mode>looped</mode>
             <path>Croisiere_int_2.wav</path>
             <condition>
-				<and>
-					<property>/addons/by-id/org.flightgear.addons.Aerotow/addon-devel/sound/enable</property>
-					<property>/sim/current-view/internal</property>
-				</and>
+                <and>
+                    <property>/addons/by-id/org.flightgear.addons.Aerotow/addon-devel/sound/enable</property>
+                    <property>/sim/current-view/internal</property>
+                </and>
             </condition>
             <volume>
                 <offset>-0.80</offset>
@@ -24,17 +24,17 @@
             <reference-dist>150.0</reference-dist>
             <max-dist>5000.0</max-dist>
         </engine>
-		<engine>
+        <engine>
             <name>engineEXT</name>
             <mode>looped</mode>
             <path>Croisiere_ext_2.wav</path>
             <condition>
-				<and>
-					<property>/addons/by-id/org.flightgear.addons.Aerotow/addon-devel/sound/enable</property>
-					<not>
-						<property>/sim/current-view/internal</property>
-					</not>
-				</and>
+                <and>
+                    <property>/addons/by-id/org.flightgear.addons.Aerotow/addon-devel/sound/enable</property>
+                    <not>
+                        <property>/sim/current-view/internal</property>
+                    </not>
+                </and>
             </condition>
             <volume>
                 <offset>-0.80</offset>

nasal/flight-plan.nas

@@ -194,7 +194,7 @@ var FlightPlan = {
 
     #
     # Generate the XML file with the flight plane for our plane for AI scenario.
-    # The file will be stored to $HOME/Export/Addons/org.flightgear.addons.Aerotow/AI/FlightPlans/aerotown-addon-flightplan.xml.
+    # The file will be stored to $FG_HOME/Export/Addons/org.flightgear.addons.Aerotow/AI/FlightPlans/aerotown-addon-flightplan.xml.
     #
     # Return true on successful, otherwise false.
     #