adding to docs

docs/_source/deployment_notes.rst

@@ -4,12 +4,16 @@
 Deployment notes
 ================
 
+Met Data Grid files
+-------------------
+
 The EWS pipeline uses an input grid to specify the points to be included in the calculations. The grid is determined by
 the UK Met Office (UKMO). The points specified within the NAME and weather data provided by the UKMO must be matched by
 the landpoint files specified below. The system used by the EWS uses a series of masks, to specify which points are over
 water, or outside country boundaries. The masking system allows faster calculation (avoiding areas that are not relevant)
-and plotting that only shows the regions of interest. The spatial grids used by the EWS pipeline must match the
-UKMO grid in number of points and sort order:
+and plotting that only shows the regions of interest. The spatial grids used by the EWS pipeline, and data used by them
+**must match the UKMO grid in number of points and sort order**
+:
 
 .. code-block:: python