r.boxplot documentation bugfix (#748)

* r.boxplot documentation bugfix
Removed a leftover </em>, made some minor changes in the text and added acknowledgements.

src/raster/r.boxplot/r.boxplot.html

@@ -89,11 +89,16 @@ <h3>Example 3</h3>
 <p>
 Below, part of the landclass96 raster map is shown, with on top the vector point
 layer with location of outliers. Curiously, for some lakes, only part of the
-raster cells are outliers.</em></p>
+raster cells are outliers.</p>
 
 <p>
 <img src="r_boxplot_map_03.png"><br>
 
+<h2>Acknowledgements</h2>
+This work was carried in the framework of the <a href="https://savethetiger.nl/" target="_blank">Save the tiger, save the grassland, save the water</a> 
+project by the 
+<a href="https://www.has.nl/en/has-research/research-groups/innovative-bio-monitoring-research-group" target="_blank">Innovative Bio-Monitoring research group</a>.  
+
 <h2>SEE ALSO</h2> 
 
 <em>
@@ -104,7 +109,6 @@ <h2>SEE ALSO</h2>
 
 <h2>AUTHOR</h2>
 
-<h2>AUTHOR</h2>
-
-Paulo van Breugel, HAS University of Applied Sciences (https://www.hasuniversity.nl/)<br>
-<a href="https://www.has.nl/en/has-research/research-groups/innovative-bio-monitoring-research-group">Innovative Bio-Monitoring research group</a>
+Paulo van Breugel<br>
+Applied Geo-information Sciences<br>
+<a href="https://www.hasuniversity.nl/">HAS University of Applied Sciences</a><br>