bugfix

Author: GiulioRossetti

docs/reference/reference.rst

@@ -36,7 +36,7 @@ In ``NDlib`` are implemented the following **Epidemic** models:
    models/epidemics/SIR.rst
    models/epidemics/SEIR.rst
    models/epidemics/SEIS.rst
-   models/epidemics/SWIS.rst
+   models/epidemics/SWIR.rst
    models/epidemics/Threshold.rst
    models/epidemics/GeneralisedThreshold.rst
    models/epidemics/KThreshold.rst