fixed typos in docs

docs/source/background.rst

@@ -5,7 +5,7 @@ Modelling the effects on the built environment of natural hazards such
 as riverine flooding, storm surges and tsunami is critical for
 understanding their economic and social impact on our urban
 communities.  Geoscience Australia and the Australian National
-University are developing a hydrodynamic inundation modelling tool
+University have developed a hydrodynamic inundation modelling tool
 called ANUGA to help simulate the impact of these hazards.
 
 The core of ANUGA is the fluid dynamics object, called :code:`anuga.Domain`,
@@ -19,18 +19,18 @@ wetting and drying as water enters and leaves an area.  This means
 that it is suitable for simulating water flow onto a beach or dry land
 and around structures such as buildings.  ANUGA is also capable
 of modelling hydraulic jumps due to the ability of the finite-volume
-method to accommodate discontinuities in the solution and the bed (using the
-latest algorithms
+method to accommodate discontinuities in the solution and the bed.
 
 To set up a particular scenario the user specifies the geometry
 (bathymetry and topography), the initial water level (stage),
 boundary conditions such as tide, and any operators  that may
 drive the system such as rainfall, abstraction of water,  erosion, culverts
 See section :doc:`operators` for details of operators available in ANUGA.
 
-The built-in mesh generator, called :code:`graphical_mesh_generator`,
+The built-in mesh generator, called :code:`graphical_mesh_generator`, or 
+the procedure :code:`anuga.create_domain_from_regions`
 allows the user to set up the geometry
-of the problem interactively and to identify boundary segments and
+of the problem and to identify boundary segments and
 regions using symbolic tags.  These tags may then be used to set the
 actual boundary conditions and attributes for different regions
 (e.g. the Manning friction coefficient) for each simulation.