Corrected some Sphinx errors.

docs/source/app_source.rst

@@ -49,12 +49,6 @@ exceptions.py
 .. automodule:: gprMax.exceptions
 
 
-fields_output.py
-================
-
-.. automodule:: gprMax.fields_output
-
-
 fields_update.pyx
 =================
 
@@ -120,6 +114,12 @@ materials.py
 .. automodule:: gprMax.materials
 
 
+output.py
+=========
+
+.. automodule:: gprMax.output
+
+
 pml_1order_update.pyx
 =====================
 

docs/source/input.rst

@@ -315,7 +315,7 @@ For example to create a model of water with a single Debye pole, :math:`\epsilon
 
 
 #add_dispersion_lorentz:
------------------------
+------------------------
 
 Allows you to add dispersive properties to an already defined ``#material`` based on a multiple pole Lorentz formulation (see :ref:`capabilities` section). For example, the susceptability function for a single-pole Lorentz material is given by: