HaralickTextureExtraction: Clarify the definition of the parameters xrad and yrad

Summary

Improve the description of the parameters xrad and yrad of the application HaralickTextureExtraction

Rationale

A question on the forum shows the documentation is not clear enough.

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

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Modules/Applications/AppTextures/app/otbHaralickTextureExtraction.cxx

@@ -131,11 +131,15 @@ private:
                             "texture parameters.");
 
     AddParameter(ParameterType_Int, "parameters.xrad", "X Radius");
-    SetParameterDescription("parameters.xrad", "X Radius");
+    SetParameterDescription("parameters.xrad",
+                            "X Radius of the neighborhood window. The formula used to retrieve the size of "
+                            "the window is ``2 * radius + 1``.");
     SetDefaultParameterInt("parameters.xrad", 2);
 
     AddParameter(ParameterType_Int, "parameters.yrad", "Y Radius");
-    SetParameterDescription("parameters.yrad", "Y Radius");
+    SetParameterDescription("parameters.yrad",
+                            "Y Radius of the neighborhood window. The formula used to retrieve the size of "
+                            "the window is ``2 * radius + 1``.");
     SetDefaultParameterInt("parameters.yrad", 2);
 
     AddParameter(ParameterType_Int, "parameters.xoff", "X Offset");