Merge pull request #1978 from OceanParcels/update_parcels_pitch_readme

Updating Parcels pitch in docs

Author: erikvansebille

docs/index.rst

@@ -2,7 +2,7 @@ Parcels documentation
 =====================
 
 
-Welcome to the documentation of Parcels. **Parcels** (Probably A Really Computationally Efficient Lagrangian Simulator) is a set of Python classes and methods to create customisable particle tracking simulations using output from Ocean Circulation models. Parcels can be used to track passive and active particulates such as water, plankton, `plastic <http://www.topios.org/>`_ and `fish <https://github.com/Jacketless/IKAMOANA>`_.
+Welcome to the documentation of Parcels. **Parcels** provides a set of Python classes and methods to create customisable particle tracking simulations using gridded output from (ocean) circulation models. Parcels can be used to track passive and active particulates such as water, plankton, `plastic <http://www.topios.org/>`_ and `fish <https://github.com/Jacketless/IKAMOANA>`_.
 
 .. figure:: _static/homepage.gif
    :class: dark-light