ENH:improve LSD application parameters documentation

Applications/FeatureExtraction/otbLineSegmentDetection.cxx

@@ -57,7 +57,7 @@ private:
 
     // Documentation
     SetDocName("Line segment detection application");
-    SetDocLongDescription("This application detects locally straight contours in a image. It is based on Burns, Hanson, and Riseman method and use an a contrario validation approach (Desolneux, Moisan, and Morel). The algorithm was published by Rafael Gromponevon Gioi, Jérémie Jakubowicz, Jean-Michel Morel and Gregory Randall. The given approach compute gradient and level lines of the image and detects aligned points in line support region. The application allows to export the detected lines in a vector data.");
+    SetDocLongDescription("This application detects locally straight contours in a image. It is based on Burns, Hanson, and Riseman method and use an a contrario validation approach (Desolneux, Moisan, and Morel). The algorithm was published by Rafael Gromponevon Gioi, Jérémie Jakubowicz, Jean-Michel Morel and Gregory Randall.\n The given approach compute gradient and level lines of the image and detects aligned points in line support region. The application allows to export the detected lines in a vector data.");
     SetDocLimitations("None");
     SetDocAuthors("OTB-Team");
     SetDocSeeAlso("On Line demonstration of the LSD algorithm is available here: http://www.ipol.im/pub/algo/gjmr_line_segment_detector/\n");
@@ -74,16 +74,16 @@ private:
     AddParameter(ParameterType_InputImage, "in", "Input Image");
 
 
-    AddParameter(ParameterType_OutputVectorData, "out", "Output detected");
-    SetParameterDescription("out"," Output detected line segments raster.");
-    AddParameter(ParameterType_Directory, "dem", "DEM directory");
+    AddParameter(ParameterType_OutputVectorData, "out", "Output Detected lines");
+    SetParameterDescription("out"," Output detected line segments (vector data).");
+    AddParameter(ParameterType_Directory, "dem", "Digital Elevation Model directory");
     MandatoryOff("dem");
 
     AddParameter(ParameterType_Empty, "norescale", "No rescaling in [0, 255]");
     MandatoryOff("norescale");
 
     // Doc example parameter settings
-    SetDocExampleParameterValue("in", "QB_Suburb.pn");
+    SetDocExampleParameterValue("in", "QB_Suburb.png");
     SetDocExampleParameterValue("out", "LineSegmentDetection.shp");
   }