cite: limit line length in in citing file

for better plain text readability and potential updates


git-svn-id: https://svn.osgeo.org/grass/grass/trunk@72926 15284696-431f-4ddb-bdfa-cd5b030d7da7

CITING

@@ -1,20 +1,33 @@
-The GRASS Development Team, the addon authors, further contributors and the user community have invested enormous efforts in making GRASS GIS available to you. Please give credit where credit is due and cite GRASS GIS and its addons when you use them for data analysis.
+The GRASS Development Team, the addon authors, further contributors and
+the user community have invested enormous efforts in making GRASS GIS
+available to you. Please give credit where credit is due and cite GRASS
+GIS and its addons when you use them for data analysis.
 
-For citation choices see below; for citing a particular GRASS GIS module, you may cite the main author(s) along with the GRASS Development Team.
+For citation choices see below; for citing a particular GRASS GIS
+module, you may cite the main author(s) along with the GRASS
+Development Team.
 
+Choices for citing the main GRASS GIS software (update YEAR and version
+number accordingly):
 
-Choices for citing the main GRASS GIS software (update YEAR and version number accordingly):
-* GRASS Development Team, YEAR. Geographic Resources Analysis Support System (GRASS) Software, Version 7.2. Open Source Geospatial Foundation. http://grass.osgeo.org
-* GRASS Development Team, YEAR. Geographic Resources Analysis Support System (GRASS) Programmer's Manual. Open Source Geospatial Foundation. Electronic document: http://grass.osgeo.org/programming7
+* GRASS Development Team, YEAR. Geographic Resources Analysis Support
+  System (GRASS) Software, Version 7.2. Open Source Geospatial
+  Foundation. http://grass.osgeo.org
+* GRASS Development Team, YEAR. Geographic Resources Analysis Support
+  System (GRASS) Programmer's Manual. Open Source Geospatial Foundation.
+  Electronic document: http://grass.osgeo.org/programming7
 
+Citing a GRASS GIS Addon (update AUTHOR(S), YEAR, Addon-NAME, and
+version number accordingly):
 
-Citing a GRASS GIS Addon (update AUTHOR(S), YEAR, Addon-NAME, and version number accordingly):
-* AUTHOR(S), and GRASS Development Team, YEAR Addon-NAME. Geographic Resources Analysis Support System (GRASS) Software, Version 7.2. Open Source Geospatial Foundation. https://grass.osgeo.org/grass7/manuals/addons/Addon-NAME.html
-
+* AUTHOR(S), and GRASS Development Team, YEAR Addon-NAME. Geographic
+  Resources Analysis Support System (GRASS) Software, Version 7.2.
+  Open Source Geospatial Foundation.
+  https://grass.osgeo.org/grass7/manuals/addons/Addon-NAME.html
 
 For other (scientific) references, see
-* https://grasswiki.osgeo.org/wiki/GRASS_Citation_Repository
 
+* https://grasswiki.osgeo.org/wiki/GRASS_Citation_Repository
 
 A BibTeX entry for LaTeX users is: