fix lr-wpan documentation build

doc/models/Makefile

@@ -305,7 +305,7 @@ IMAGES_EPS = \
 	$(FIGURES)/lte-epc-x2-entity-saps.eps \
 	$(FIGURES)/lte-strongest-cell-handover-algorithm.eps \
 	$(FIGURES)/auvmobility-classes.eps \
-	$(FIGURES)/spectrum-analyzer-example.eps \ 
+	$(FIGURES)/spectrum-analyzer-example.eps \
 	$(FIGURES)/lr-wpan-primitives.eps \
 	$(FIGURES)/lr-wpan-data-example.eps \
 	$(FIGURES)/lr-wpan-arch.eps \

doc/models/source/index.rst

@@ -33,6 +33,7 @@ This document is written in `reStructuredText <http://docutils.sourceforge.net/r
    energy
    flow-monitor
    internet-models
+   lr-wpan
    lte
    mesh
    distributed