Corrected some formatting.

docs/source/input.rst

@@ -773,7 +773,7 @@ Allows you to introduce output points into the model. These are locations where
     * When the optional parameters ``str1`` and ``str2`` are not given all the electric and magnetic field components and currents will be output with the receiver point.
 
 #rx_array:
---------
+----------
 
 Provides a simple method of defining multiple output points in the model. The syntax of the command is: