testing: remove note about specific test server (introduced in https://trac.osgeo.org/grass/changeset/62358)

The documentation does not document specific how tests are executed at specific machine but it is a general description how things works. The file contains example how to set up a cron job using a (example) shell script which wraps several steps together. There can (and should) be (any) number of machines running the test and different other checks besides the fact that developers should run the tests on their machines before the commit for example using a script similar to one provided.

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@62362 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/docs/src/gunittest_running_tests.rst

@@ -72,8 +72,11 @@ Example Bash script to run be used as a cron job
     echo "Nightly ($NOW) GRASS GIS test finished: $(date $DATE_FLAGS)" >> $LOGFILE
 
 A script similar to this one can be used as a cron job, on most Linux systems
-using ``crontab -e`` and adding the following line::
+using ``crontab -e`` and adding a line similar to the following one::
 
-    0 4 * * 1 /home/vpetras/grasstests/test_grass_gis.sh
+    0 4 * * 1 .../grasstests/test_grass_gis.sh
 
-Which will perform the tests every Monday at 4am in the (North Carolina) morning.
+Which will perform the tests every Monday at 4:00 in the morning (local time).
+
+Particular script and frequency depends on what you want to test and
+how many resources you want to use.