ENH: improve documentation of convert app

Modules/Applications/AppImageUtils/app/otbConvert.cxx

@@ -82,7 +82,7 @@ private:
                    " and/or changing the pixel type.");
     // Documentation
     SetDocName("Image Conversion");
-    SetDocLongDescription("This application performs an image pixel type conversion (short, ushort, uchar, int, uint, float and double types are handled). The output image is written in the specified format (ie. that corresponds to the given extension).\n The convertion can include a rescale using the image 2 percent minimum and maximum values. The rescale can be linear or log2.");
+    SetDocLongDescription("This application performs an image pixel type conversion (short, ushort, uchar, int, uint, float and double types are handled). The output image is written in the specified format (ie. that corresponds to the given extension).\n The conversion can include a rescale using the image 2 percent minimum and maximum values. The rescale can be linear or log2.");
     SetDocLimitations("None");
     SetDocAuthors("OTB-Team");
     SetDocSeeAlso("Rescale");