Assorted small fixes

* Incorrect comment (copy+paste error) in nla_edit
* Whitespace in rna_gpencil
* The icon for AnimData is now attached to its RNA definition

source/blender/editors/space_nla/nla_edit.c

@@ -200,7 +200,7 @@ static int nlaedit_disable_tweakmode_exec(bContext *C, wmOperator *op)
 	for (ale = anim_data.first; ale; ale = ale->next) {
 		AnimData *adt = ale->data;
 		
-		/* try entering tweakmode if valid */
+		/* to be sure, just exit tweakmode... */
 		BKE_nla_tweakmode_exit(adt);
 	}
 	

source/blender/makesrna/intern/rna_animation.c

@@ -895,6 +895,7 @@ static void rna_def_animdata(BlenderRNA *brna)
 	
 	srna = RNA_def_struct(brna, "AnimData", NULL);
 	RNA_def_struct_ui_text(srna, "Animation Data", "Animation data for datablock");
+	RNA_def_struct_ui_icon(srna, ICON_ANIM_DATA);
 	
 	/* NLA */
 	prop = RNA_def_property(srna, "nla_tracks", PROP_COLLECTION, PROP_NONE);

source/blender/makesrna/intern/rna_gpencil.c

@@ -548,7 +548,9 @@ static void rna_def_gpencil_layer(BlenderRNA *brna)
 	RNA_def_property_boolean_negative_sdna(prop, NULL, "flag", GP_LAYER_NO_XRAY);
 	RNA_def_property_ui_text(prop, "X Ray", "Make the layer draw in front of objects");
 	RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, "rna_GPencil_update");
-
+	
+	
+	/* Layers API */
 	func = RNA_def_function(srna, "clear", "rna_GPencil_layer_clear");
 	RNA_def_function_ui_description(func, "Remove all the grease pencil layer data");
 }