Update index.rst (#86)

docs/index.rst

@@ -15,10 +15,10 @@ Multiple Block instances together make a view. Each Block has the ``get_data``
 method that fetches the data in one go, as well as a ``get_compute_graph``
 method that creates a graph to compute the data later.
 
-Blocks are used for the on-the-fly modification of raster- and vectordata,
+Blocks are used for the on-the-fly modification of raster and vector data,
 respectively through the baseclasses :meth:`~dask_geomodeling.raster.base.RasterBlock` and
 :meth:`~dask_geomodeling.geometry.base.GeometryBlock`. Derived classes support
-operations such has grouping
+operations such as grouping, 
 basic math, shifting time, smoothing, reclassification, geometry operations,
 zonal statistics, and property field operations.