fix title level error

Author: shunt16

docs/content/user/templater.rst

@@ -164,7 +164,7 @@ Combining the above together a template dataset can be created as follows:
 Where ``ds`` is an empty xarray dataset with variables defined by the template definition. Fill values for the empty arrays are chosen using the `cf convention values <http://cfconventions.org/cf-conventions/cf-conventions.html#missing-data>`_.
 
 Populating and writing the dataset
-----------------------------------
+==================================
 
 `Populating <http://xarray.pydata.org/en/stable/user-guide/data-structures.html#dictionary-like-methods>`_ and `writing <http://xarray.pydata.org/en/stable/user-guide/io.html#reading-and-writing-files>`_ the dataset can be achieved using xarray's builtin functionality. Here's a dummy example: