grass7 helptext: 'Sample data' section added

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@69633 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/init/grass7.html

@@ -84,6 +84,17 @@ specified exists and that you can access it successfully. If any of
 these checks fail then <em>grass70</em> will automatically switch back
 to the text user interface mode.
 
+<h2>SAMPLE DATA</h2>
+
+The GRASS GIS project provides several free sample geospatial datasets
+as ready-to-use locations. They are available to download at
+<a href="https://grass.osgeo.org/download/sample-data/">https://grass.osgeo.org/download/sample-data/</a>.
+
+The "North Carolina data set" is a modern package of geospatial data from
+North Carolina (USA), and it includes raster, vector, LiDAR and satellite
+data. This is the most extensively used data set in the documentation and
+the examples throughout the user manual pages are based upon it.
+
 <h2>ENVIRONMENT VARIABLES</h2>
 
 A number of environment variables are available at GRASS startup to
@@ -186,7 +197,7 @@ environment variables. The available variables are as follows:
 <dl>
 <dt>LOCATION
 <dd> A fully qualified path to a mapset
-    (eg <tt>/usr/local/share/grassdata/spearfish60/PERMANENT</tt>). This
+    (eg <tt>/usr/local/share/grassdata/spearfish70/PERMANENT</tt>). This
     environment variable overrides the GISDBASE, LOCATION_NAME, and
     MAPSET variables.
 <dt>GISDBASE
@@ -264,9 +275,9 @@ The following are some possible examples.
 The environment variables are defined as follows:
     
 <div class="code"><pre>
-LOCATION = /usr/local/share/grassdata/spearfish60/PERMANENT
+LOCATION = /usr/local/share/grassdata/spearfish70/PERMANENT
 GISDBASE = /usr/local/share/grassdata
-LOCATION_NAME = spearfish60
+LOCATION_NAME = spearfish70
 MAPSET = PERMANENT
 </pre></div>